diff --git a/doc/specs/udmf_srb2.txt b/doc/specs/udmf_srb2.txt
index d6d71a0d5f7217482422799a4e521714e604b204..eaa3a8a9704439b72569aee0a0c4db956e8d8482 100644
--- a/doc/specs/udmf_srb2.txt
+++ b/doc/specs/udmf_srb2.txt
@@ -1,5 +1,5 @@
 ===============================================================================
-Universal Doom Map Format Sonic Robo Blast 2 extensions v1.0 19.02.2024
+Universal Doom Map Format Sonic Robo Blast 2 extensions v1.0 19.06.2024
 
     Copyright (c) 2024 Sonic Team Junior
        uses Universal Doom Map Format Specification v1.1 as a template,
@@ -143,6 +143,9 @@ Sonic Robo Blast 2 defines the following standardized fields:
       offsetx_bottom = <float>;        // X offset for lower texture. Default = 0.0.
       offsety_bottom = <float>;        // Y offset for lower texture. Default = 0.0.
 
+      light = <integer>;               // Light level, relative to 'sector' light level. Default = 0.
+      lightabsolute = <bool>;          // true = 'light' is an absolute value, ignoring 'sector' light level.
+
       comment = <string>; // A comment. Implementors should attach no special
                           // semantic meaning to this field.
    }
diff --git a/extras/conf/udb/Includes/SRB222_common.cfg b/extras/conf/udb/Includes/SRB222_common.cfg
index 90c85cdea40827970a7b44222e9a2f6a5e2668f6..e5cafead431c0d79eaaef734eee008eeab89dd15 100644
--- a/extras/conf/udb/Includes/SRB222_common.cfg
+++ b/extras/conf/udb/Includes/SRB222_common.cfg
@@ -115,7 +115,7 @@ mapformat_udmf
 
 	// Enables setting distinct brightness for floor, ceiling, and walls
 	distinctfloorandceilingbrightness = true;
-	distinctwallbrightness = false;
+	distinctwallbrightness = true;
 
 	// Enables setting distinct brightness for upper, middle, and lower sidedef parts
 	distinctsidedefpartbrightness = false;
diff --git a/extras/conf/udb/Includes/SRB222_misc.cfg b/extras/conf/udb/Includes/SRB222_misc.cfg
index 37b01d7dd56eadaeb1eb3ae4759fb74efc79e61f..c37c29ce0def1f471565d7d4494ac7ab833eb054 100644
--- a/extras/conf/udb/Includes/SRB222_misc.cfg
+++ b/extras/conf/udb/Includes/SRB222_misc.cfg
@@ -280,18 +280,18 @@ universalfields
 			default = "";
 		}
 		
-		//light
-		//{
-		//	type = 0;
-		//	default = 0;
-		//}
-		//
-		//lightabsolute
-		//{
-		//	type = 3;
-		//	default = false;
-		//}
-		//
+		light
+		{
+			type = 0;
+			default = 0;
+		}
+		
+		lightabsolute
+		{
+			type = 3;
+			default = false;
+		}
+		
 		//light_top
 		//{
 		//	type = 0;
diff --git a/src/d_main.c b/src/d_main.c
index 3a3a0b26a3ee5213ef7bffb7cd881079e20bea22..bad78c53070174e215416ce1fe9ed51b090c84c0 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -1535,7 +1535,7 @@ void D_SRB2Main(void)
 			I_Error("Cannot find a map remotely named '%s'\n", word);
 		else
 		{
-			if (!M_CheckParm("-server"))
+			if (!(M_CheckParm("-server") || dedicated))
 				G_SetUsedCheats(true);
 			autostart = true;
 		}
diff --git a/src/hardware/hw_main.c b/src/hardware/hw_main.c
index 87c5f8e328aa8e918d942cf9b1b506a0db9c2111..c70b6dd01f79487b80d3e74f47926da3054ec80a 100644
--- a/src/hardware/hw_main.c
+++ b/src/hardware/hw_main.c
@@ -309,6 +309,43 @@ static FUINT HWR_CalcSlopeLight(FUINT lightnum, angle_t dir, fixed_t delta)
 	return (FUINT)finallight;
 }
 
+static FUINT HWR_SideLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light +
+		((side->lightabsolute) ? 0 : base_lightlevel);
+}
+
+/* TODO: implement per-texture lighting
+static FUINT HWR_TopLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_top +
+		((side->lightabsolute_top) ? 0 : HWR_SideLightLevel(side, base_lightlevel));
+}
+
+static FUINT HWR_MidLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_mid +
+		((side->lightabsolute_mid) ? 0 : HWR_SideLightLevel(side, base_lightlevel));
+}
+
+static FUINT HWR_BottomLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_bottom +
+		((side->lightabsolute_bottom) ? 0 : HWR_SideLightLevel(side, base_lightlevel));
+}
+*/
+
+static UINT8 HWR_FloorLightLevel(sector_t *sector, UINT8 base_lightlevel)
+{
+	return max(0, min(255, sector->floorlightlevel +
+		((sector->floorlightabsolute) ? 0 : base_lightlevel)));
+}
+
+static UINT8 HWR_CeilingLightLevel(sector_t *sector, UINT8 base_lightlevel)
+{
+	return max(0, min(255, sector->ceilinglightlevel +
+		((sector->ceilinglightabsolute) ? 0 : base_lightlevel)));
+}
 // ==========================================================================
 //                                   FLOOR/CEILING GENERATION FROM SUBSECTORS
 // ==========================================================================
@@ -705,8 +742,9 @@ static void HWR_SplitWall(sector_t *sector, FOutVector *wallVerts, INT32 texnum,
 	fixed_t v2x = FloatToFixed(wallVerts[1].x);
 	fixed_t v2y = FloatToFixed(wallVerts[1].z);
 
+	FUINT lightnum = HWR_SideLightLevel(gl_sidedef, sector->lightlevel);
 	const UINT8 alpha = Surf->PolyColor.s.alpha;
-	FUINT lightnum = HWR_CalcWallLight(sector->lightlevel, v1x, v1y, v2x, v2y);
+	lightnum = HWR_CalcWallLight(lightnum, v1x, v1y, v2x, v2y);
 	extracolormap_t *colormap = NULL;
 
 	if (!r_renderwalls)
@@ -750,13 +788,13 @@ static void HWR_SplitWall(sector_t *sector, FOutVector *wallVerts, INT32 texnum,
 		{
 			if (pfloor && (pfloor->fofflags & FOF_FOG))
 			{
-				lightnum = pfloor->master->frontsector->lightlevel;
+				lightnum = HWR_SideLightLevel(gl_sidedef, pfloor->master->frontsector->lightlevel);
 				colormap = pfloor->master->frontsector->extra_colormap;
 				lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, v1x, v1y, v2x, v2y);
 			}
 			else
 			{
-				lightnum = *list[i].lightlevel;
+				lightnum = HWR_SideLightLevel(gl_sidedef, *list[i].lightlevel);
 				colormap = *list[i].extra_colormap;
 				lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, v1x, v1y, v2x, v2y);
 			}
@@ -1167,7 +1205,7 @@ static void HWR_ProcessSeg(void)
 	float cliplow = (float)gl_curline->offset;
 	float cliphigh = cliplow + (gl_curline->flength * FRACUNIT);
 
-	FUINT lightnum = gl_frontsector->lightlevel;
+	FUINT lightnum = HWR_SideLightLevel(gl_sidedef, gl_frontsector->lightlevel);
 	extracolormap_t *colormap = gl_frontsector->extra_colormap;
 	lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, vs.x, vs.y, ve.x, ve.y);
 
@@ -1628,11 +1666,11 @@ static void HWR_ProcessSeg(void)
 				{
 					blendmode = PF_Fog|PF_NoTexture;
 
-					lightnum = rover->master->frontsector->lightlevel;
+					lightnum = HWR_SideLightLevel(gl_sidedef, rover->master->frontsector->lightlevel);
 					colormap = rover->master->frontsector->extra_colormap;
 					lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, vs.x, vs.y, ve.x, ve.y);
 
-					Surf.PolyColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel, rover->master->frontsector->extra_colormap);
+					Surf.PolyColor.s.alpha = HWR_FogBlockAlpha(HWR_SideLightLevel(gl_sidedef, rover->master->frontsector->lightlevel), rover->master->frontsector->extra_colormap);
 
 					if (gl_frontsector->numlights)
 						HWR_SplitWall(gl_frontsector, wallVerts, 0, &Surf, rover->fofflags, rover, blendmode);
@@ -1785,7 +1823,7 @@ static void HWR_ProcessSeg(void)
 				{
 					blendmode = PF_Fog|PF_NoTexture;
 
-					lightnum = rover->master->frontsector->lightlevel;
+					lightnum = HWR_SideLightLevel(gl_sidedef, rover->master->frontsector->lightlevel);
 					colormap = rover->master->frontsector->extra_colormap;
 					lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, vs.x, vs.y, ve.x, ve.y);
 
@@ -2442,7 +2480,7 @@ static void HWR_Subsector(size_t num)
 			rover; rover = rover->next)
 		{
 			fixed_t bottomCullHeight, topCullHeight, centerHeight;
-
+			
 			if (!(rover->fofflags & FOF_EXISTS) || !(rover->fofflags & FOF_RENDERPLANES))
 				continue;
 			if (sub->validcount == validcount)
@@ -2471,13 +2509,13 @@ static void HWR_Subsector(size_t num)
 					UINT8 alpha;
 
 					light = R_GetPlaneLight(gl_frontsector, centerHeight, viewz < bottomCullHeight ? true : false);
-					alpha = HWR_FogBlockAlpha(*gl_frontsector->lightlist[light].lightlevel, rover->master->frontsector->extra_colormap);
+					alpha = HWR_FogBlockAlpha(HWR_FloorLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel), rover->master->frontsector->extra_colormap);
 
 					HWR_AddTransparentFloor(0,
 					                       &extrasubsectors[num],
 										   false,
 					                       *rover->bottomheight,
-					                       *gl_frontsector->lightlist[light].lightlevel,
+					                       HWR_FloorLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel),
 					                       alpha, rover->master->frontsector, PF_Fog|PF_NoTexture,
 										   true, false, rover->master->frontsector->extra_colormap);
 				}
@@ -2489,7 +2527,7 @@ static void HWR_Subsector(size_t num)
 					                       &extrasubsectors[num],
 										   false,
 					                       *rover->bottomheight,
-					                       *gl_frontsector->lightlist[light].lightlevel,
+					                       HWR_FloorLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel),
 					                       max(0, min(rover->alpha, 255)), rover->master->frontsector,
 					                       HWR_RippleBlend(gl_frontsector, rover, false) | (rover->blend ? HWR_GetBlendModeFlag(rover->blend) : PF_Translucent),
 					                       false, rover->fofflags & FOF_SPLAT, *gl_frontsector->lightlist[light].extra_colormap);
@@ -2498,8 +2536,9 @@ static void HWR_Subsector(size_t num)
 				{
 					HWR_GetLevelFlat(&levelflats[*rover->bottompic], rover->fofflags & FOF_SPLAT);
 					light = R_GetPlaneLight(gl_frontsector, centerHeight, viewz < bottomCullHeight ? true : false);
-					HWR_RenderPlane(sub, &extrasubsectors[num], false, *rover->bottomheight, HWR_RippleBlend(gl_frontsector, rover, false)|PF_Occlude, *gl_frontsector->lightlist[light].lightlevel, &levelflats[*rover->bottompic],
-					                rover->master->frontsector, 255, *gl_frontsector->lightlist[light].extra_colormap);
+					HWR_RenderPlane(sub, &extrasubsectors[num], false, *rover->bottomheight, HWR_RippleBlend(gl_frontsector, rover, false)|PF_Occlude,
+					                HWR_FloorLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel),
+					                &levelflats[*rover->bottompic], rover->master->frontsector, 255, *gl_frontsector->lightlist[light].extra_colormap);
 				}
 			}
 
@@ -2516,13 +2555,13 @@ static void HWR_Subsector(size_t num)
 					UINT8 alpha;
 
 					light = R_GetPlaneLight(gl_frontsector, centerHeight, viewz < topCullHeight ? true : false);
-					alpha = HWR_FogBlockAlpha(*gl_frontsector->lightlist[light].lightlevel, rover->master->frontsector->extra_colormap);
+					alpha = HWR_FogBlockAlpha(HWR_CeilingLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel), rover->master->frontsector->extra_colormap);
 
 					HWR_AddTransparentFloor(0,
 					                       &extrasubsectors[num],
 										   true,
 					                       *rover->topheight,
-					                       *gl_frontsector->lightlist[light].lightlevel,
+					                       HWR_CeilingLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel),
 					                       alpha, rover->master->frontsector, PF_Fog|PF_NoTexture,
 										   true, false, rover->master->frontsector->extra_colormap);
 				}
@@ -2534,7 +2573,7 @@ static void HWR_Subsector(size_t num)
 					                        &extrasubsectors[num],
 											true,
 					                        *rover->topheight,
-					                        *gl_frontsector->lightlist[light].lightlevel,
+					                        HWR_CeilingLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel),
 					                        max(0, min(rover->alpha, 255)), rover->master->frontsector,
 					                        HWR_RippleBlend(gl_frontsector, rover, false) | (rover->blend ? HWR_GetBlendModeFlag(rover->blend) : PF_Translucent),
 					                        false, rover->fofflags & FOF_SPLAT, *gl_frontsector->lightlist[light].extra_colormap);
@@ -2543,8 +2582,9 @@ static void HWR_Subsector(size_t num)
 				{
 					HWR_GetLevelFlat(&levelflats[*rover->toppic], rover->fofflags & FOF_SPLAT);
 					light = R_GetPlaneLight(gl_frontsector, centerHeight, viewz < topCullHeight ? true : false);
-					HWR_RenderPlane(sub, &extrasubsectors[num], true, *rover->topheight, HWR_RippleBlend(gl_frontsector, rover, false)|PF_Occlude, *gl_frontsector->lightlist[light].lightlevel, &levelflats[*rover->toppic],
-					                  rover->master->frontsector, 255, *gl_frontsector->lightlist[light].extra_colormap);
+					HWR_RenderPlane(sub, &extrasubsectors[num], true, *rover->topheight, HWR_RippleBlend(gl_frontsector, rover, false)|PF_Occlude,
+					                  HWR_CeilingLightLevel(rover->master->frontsector, *gl_frontsector->lightlist[light].lightlevel),
+					                  &levelflats[*rover->toppic], rover->master->frontsector, 255, *gl_frontsector->lightlist[light].extra_colormap);
 				}
 			}
 		}
@@ -3906,7 +3946,7 @@ void HWR_AddTransparentFloor(levelflat_t *levelflat, extrasubsector_t *xsub, boo
 
 	planeinfo[numplanes].isceiling = isceiling;
 	planeinfo[numplanes].fixedheight = fixedheight;
-	planeinfo[numplanes].lightlevel = (planecolormap && (planecolormap->flags & CMF_FOG)) ? 255 : lightlevel;
+	planeinfo[numplanes].lightlevel = (planecolormap && (planecolormap->flags & CMF_FOG)) ? lightlevel : 255; // TODO: 2.3: Make transparent FOF planes always use light level
 	planeinfo[numplanes].levelflat = levelflat;
 	planeinfo[numplanes].xsub = xsub;
 	planeinfo[numplanes].alpha = alpha;
@@ -3938,7 +3978,7 @@ void HWR_AddTransparentPolyobjectFloor(levelflat_t *levelflat, polyobj_t *polyse
 
 	polyplaneinfo[numpolyplanes].isceiling = isceiling;
 	polyplaneinfo[numpolyplanes].fixedheight = fixedheight;
-	polyplaneinfo[numpolyplanes].lightlevel = (planecolormap && (planecolormap->flags & CMF_FOG)) ? 255 : lightlevel;
+	polyplaneinfo[numpolyplanes].lightlevel = (planecolormap && (planecolormap->flags & CMF_FOG)) ? lightlevel : 255;  // TODO: 2.3: Make transparent polyobject planes always use light level
 	polyplaneinfo[numpolyplanes].levelflat = levelflat;
 	polyplaneinfo[numpolyplanes].polysector = polysector;
 	polyplaneinfo[numpolyplanes].alpha = alpha;
diff --git a/src/lua_maplib.c b/src/lua_maplib.c
index 6b489f22b1939941c0ebf83a5a3ae0b7e215de5a..9985e5631201752eddf1ba2abc71aa7304da8f62 100644
--- a/src/lua_maplib.c
+++ b/src/lua_maplib.c
@@ -213,6 +213,14 @@ enum side_e {
 	side_sector,
 	side_special,
 	side_repeatcnt,
+	side_light,
+	side_light_top,
+	side_light_mid,
+	side_light_bottom,
+	side_lightabsolute,
+	side_lightabsolute_top,
+	side_lightabsolute_mid,
+	side_lightabsolute_bottom,
 	side_text
 };
 
@@ -241,6 +249,14 @@ static const char *const side_opt[] = {
 	"sector",
 	"special",
 	"repeatcnt",
+	"light",
+	"light_top",
+	"light_mid",
+	"light_bottom",
+	"lightabsolute",
+	"lightabsolute_top",
+	"lightabsolute_mid",
+	"lightabsolute_bottom",
 	"text",
 	NULL};
 
@@ -1311,6 +1327,30 @@ static int side_get(lua_State *L)
 	case side_repeatcnt:
 		lua_pushinteger(L, side->repeatcnt);
 		return 1;
+	case side_light:
+		lua_pushinteger(L, side->light);
+		return 1;
+	case side_light_top:
+		lua_pushinteger(L, side->light_top);
+		return 1;
+	case side_light_mid:
+		lua_pushinteger(L, side->light_mid);
+		return 1;
+	case side_light_bottom:
+		lua_pushinteger(L, side->light_bottom);
+		return 1;
+	case side_lightabsolute:
+		lua_pushboolean(L, side->lightabsolute);
+		return 1;
+	case side_lightabsolute_top:
+		lua_pushboolean(L, side->lightabsolute_top);
+		return 1;
+	case side_lightabsolute_mid:
+		lua_pushboolean(L, side->lightabsolute_mid);
+		return 1;
+	case side_lightabsolute_bottom:
+		lua_pushboolean(L, side->lightabsolute_bottom);
+		return 1;
 	// TODO: 2.3: Delete
 	case side_text:
 		{
@@ -1413,6 +1453,30 @@ static int side_set(lua_State *L)
 	case side_repeatcnt:
 		side->repeatcnt = luaL_checkinteger(L, 3);
 		break;
+	case side_light:
+		side->light = luaL_checkinteger(L, 3);
+		break;
+	case side_light_top:
+		side->light_top = luaL_checkinteger(L, 3);
+		break;
+	case side_light_mid:
+		side->light_mid = luaL_checkinteger(L, 3);
+		break;
+	case side_light_bottom:
+		side->light_bottom = luaL_checkinteger(L, 3);
+		break;
+	case side_lightabsolute:
+		side->lightabsolute = luaL_checkboolean(L, 3);
+		break;
+	case side_lightabsolute_top:
+		side->lightabsolute_top = luaL_checkboolean(L, 3);
+		break;
+	case side_lightabsolute_mid:
+		side->lightabsolute_mid = luaL_checkboolean(L, 3);
+		break;
+	case side_lightabsolute_bottom:
+		side->lightabsolute_bottom = luaL_checkboolean(L, 3);
+		break;
 	}
 	return 0;
 }
diff --git a/src/m_cond.c b/src/m_cond.c
index 5a5913297157e24ada893ca5fad77a4d38ffd3e3..fa6cda223c376b2f458605ec4f99e23e1c28c2d2 100644
--- a/src/m_cond.c
+++ b/src/m_cond.c
@@ -494,6 +494,12 @@ UINT8 M_MapLocked(INT32 mapnum, gamedata_t *data)
 
 UINT8 M_CampaignWarpIsCheat(INT32 gt, INT32 mapnum, gamedata_t *data)
 {
+	if (dedicated)
+	{
+		// See M_MapLocked; don't make dedicated servers annoying.
+		return false;
+	}
+
 	if (M_MapLocked(mapnum, data) == true)
 	{
 		// Warping to locked maps is definitely always a cheat
diff --git a/src/p_saveg.c b/src/p_saveg.c
index 219410bb63741e0ca0eb138cc57cf3323665e297..da73dd8a0e1470a1fafd4f5285923ea29c70b7fb 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -919,7 +919,11 @@ enum
 	LD_SDMIDLIGHT    = 1<<19,
 	LD_SDBOTLIGHT    = 1<<20,
 	LD_SDREPEATCNT   = 1<<21,
-	LD_SDFLAGS       = 1<<22
+	LD_SDFLAGS       = 1<<22,
+	LD_SDLIGHTABS    = 1<<23,
+	LD_SDTOPLIGHTABS = 1<<24,
+	LD_SDMIDLIGHTABS = 1<<25,
+	LD_SDBOTLIGHTABS = 1<<26
 };
 
 static boolean P_AreArgsEqual(const line_t *li, const line_t *spawnli)
@@ -1393,6 +1397,22 @@ static UINT32 GetSideDiff(const side_t *si, const side_t *spawnsi)
 		diff |= LD_SDBOTSCALEY;
 	if (si->repeatcnt != spawnsi->repeatcnt)
 		diff |= LD_SDREPEATCNT;
+	if (si->light != spawnsi->light)
+		diff |= LD_SDLIGHT;
+	if (si->light_top != spawnsi->light_top)
+		diff |= LD_SDTOPLIGHT;
+	if (si->light_mid != spawnsi->light_mid)
+		diff |= LD_SDMIDLIGHT;
+	if (si->light_bottom != spawnsi->light_bottom)
+		diff |= LD_SDBOTLIGHT;
+	if (si->lightabsolute != spawnsi->lightabsolute)
+		diff |= LD_SDLIGHTABS;
+	if (si->lightabsolute_top != spawnsi->lightabsolute_top)
+		diff |= LD_SDTOPLIGHTABS;
+	if (si->lightabsolute_mid != spawnsi->lightabsolute_mid)
+		diff |= LD_SDMIDLIGHTABS;
+	if (si->lightabsolute_bottom != spawnsi->lightabsolute_bottom)
+		diff |= LD_SDBOTLIGHTABS;
 	return diff;
 }
 
@@ -1436,6 +1456,22 @@ static void ArchiveSide(const side_t *si, UINT32 diff)
 		WRITEFIXED(save_p, si->scaley_bottom);
 	if (diff & LD_SDREPEATCNT)
 		WRITEINT16(save_p, si->repeatcnt);
+	if (diff & LD_SDLIGHT)
+		WRITEINT16(save_p, si->light);
+	if (diff & LD_SDTOPLIGHT)
+		WRITEINT16(save_p, si->light_top);
+	if (diff & LD_SDMIDLIGHT)
+		WRITEINT16(save_p, si->light_mid);
+	if (diff & LD_SDBOTLIGHT)
+		WRITEINT16(save_p, si->light_bottom);
+	if (diff & LD_SDLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute);
+	if (diff & LD_SDTOPLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute_top);
+	if (diff & LD_SDMIDLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute_mid);
+	if (diff & LD_SDBOTLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute_bottom);
 }
 
 static void ArchiveLines(void)
@@ -1576,6 +1612,22 @@ static void UnArchiveSide(side_t *si)
 		si->scaley_bottom = READFIXED(save_p);
 	if (diff & LD_SDREPEATCNT)
 		si->repeatcnt = READINT16(save_p);
+	if (diff & LD_SDLIGHT)
+		si->light = READINT16(save_p);
+	if (diff & LD_SDTOPLIGHT)
+		si->light_top = READINT16(save_p);
+	if (diff & LD_SDMIDLIGHT)
+		si->light_mid = READINT16(save_p);
+	if (diff & LD_SDBOTLIGHT)
+		si->light_bottom = READINT16(save_p);
+	if (diff & LD_SDLIGHTABS)
+		si->lightabsolute = READUINT8(save_p);
+	if (diff & LD_SDTOPLIGHTABS)
+		si->lightabsolute_top = READUINT8(save_p);
+	if (diff & LD_SDMIDLIGHTABS)
+		si->lightabsolute_mid = READUINT8(save_p);
+	if (diff & LD_SDBOTLIGHTABS)
+		si->lightabsolute_bottom = READUINT8(save_p);
 }
 
 static void UnArchiveLines(void)
@@ -3245,6 +3297,8 @@ static thinker_t* LoadMobjThinker(actionf_p1 thinker)
 		mobj->translation = READUINT16(save_p);
 	if (diff2 & MD2_ALPHA)
 		mobj->alpha = READFIXED(save_p);
+	else
+		mobj->alpha = FRACUNIT;
 
 	if (diff & MD_REDFLAG)
 	{
diff --git a/src/p_setup.c b/src/p_setup.c
index e9bd69dc5ff0beef361b33c401e6fb18e1f78c45..b5ed485d8a7df9512ce24a4b78f61e950280b280 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -1367,6 +1367,9 @@ static void P_LoadSidedefs(UINT8 *data)
 		sd->scalex_top = sd->scalex_mid = sd->scalex_bottom = FRACUNIT;
 		sd->scaley_top = sd->scaley_mid = sd->scaley_bottom = FRACUNIT;
 
+		sd->light = sd->light_top = sd->light_mid = sd->light_bottom = 0;
+		sd->lightabsolute = sd->lightabsolute_top = sd->lightabsolute_mid = sd->lightabsolute_bottom = false;
+
 		P_SetSidedefSector(i, (UINT16)SHORT(msd->sector));
 
 		// Special info stored in texture fields!
@@ -1977,6 +1980,22 @@ static void ParseTextmapSidedefParameter(UINT32 i, const char *param, const char
 		P_SetSidedefSector(i, atol(val));
 	else if (fastcmp(param, "repeatcnt"))
 		sides[i].repeatcnt = atol(val);
+	else if (fastcmp(param, "light"))
+		sides[i].light = atol(val);
+	else if (fastcmp(param, "light_top"))
+		sides[i].light_top = atol(val);
+	else if (fastcmp(param, "light_mid"))
+		sides[i].light_mid = atol(val);
+	else if (fastcmp(param, "light_bottom"))
+		sides[i].light_bottom = atol(val);
+	else if (fastcmp(param, "lightabsolute") && fastcmp("true", val))
+		sides[i].lightabsolute = true;
+	else if (fastcmp(param, "lightabsolute_top") && fastcmp("true", val))
+		sides[i].lightabsolute_top = true;
+	else if (fastcmp(param, "lightabsolute_mid") && fastcmp("true", val))
+		sides[i].lightabsolute_mid = true;
+	else if (fastcmp(param, "lightabsolute_bottom") && fastcmp("true", val))
+		sides[i].lightabsolute_bottom = true;
 }
 
 static void ParseTextmapLinedefParameter(UINT32 i, const char *param, const char *val)
@@ -2704,6 +2723,22 @@ static void P_WriteTextmap(void)
 			fprintf(f, "texturemiddle = \"%.*s\";\n", 8, textures[wsides[i].midtexture]->name);
 		if (wsides[i].repeatcnt != 0)
 			fprintf(f, "repeatcnt = %d;\n", wsides[i].repeatcnt);
+		if (wsides[i].light != 0)
+			fprintf(f, "light = %d;\n", wsides[i].light);
+		if (wsides[i].light_top != 0)
+			fprintf(f, "light_top = %d;\n", wsides[i].light_top);
+		if (wsides[i].light_mid != 0)
+			fprintf(f, "light_mid = %d;\n", wsides[i].light_mid);
+		if (wsides[i].light_bottom != 0)
+			fprintf(f, "light_bottom = %d;\n", wsides[i].light_bottom);
+		if (wsides[i].lightabsolute)
+			fprintf(f, "lightabsolute = true;\n");
+		if (wsides[i].lightabsolute_top)
+			fprintf(f, "lightabsolute_top = true;\n");
+		if (wsides[i].lightabsolute_mid)
+			fprintf(f, "lightabsolute_mid = true;\n");
+		if (wsides[i].lightabsolute_bottom)
+			fprintf(f, "lightabsolute_bottom = true;\n");
 		fprintf(f, "}\n");
 		fprintf(f, "\n");
 	}
@@ -3106,6 +3141,8 @@ static void P_LoadTextmap(void)
 		sd->bottomtexture = R_TextureNumForName("-");
 		sd->sector = NULL;
 		sd->repeatcnt = 0;
+		sd->light = sd->light_top = sd->light_mid = sd->light_bottom = 0;
+		sd->lightabsolute = sd->lightabsolute_top = sd->lightabsolute_mid = sd->lightabsolute_bottom = false;
 
 		TextmapParse(sidedefBlocks.pos[i], i, ParseTextmapSidedefParameter);
 
diff --git a/src/r_bsp.c b/src/r_bsp.c
index d606d7a274b322e932cdd9778ea9d780748c7394..4b4c81b882986478eb682c4b17cb77d035409bee 100644
--- a/src/r_bsp.c
+++ b/src/r_bsp.c
@@ -230,6 +230,18 @@ static INT32 R_DoorClosed(void)
 	&& (backsector->floorheight <= frontsector->floorheight || curline->sidedef->bottomtexture);
 }
 
+static UINT8 R_FloorLightLevel(sector_t *sector, UINT8 base_lightlevel)
+{
+	return max(0, min(255, sector->floorlightlevel +
+		((sector->floorlightabsolute) ? 0 : base_lightlevel)));
+}
+
+static UINT8 R_CeilingLightLevel(sector_t *sector, UINT8 base_lightlevel)
+{
+	return max(0, min(255, sector->ceilinglightlevel +
+		((sector->ceilinglightabsolute) ? 0 : base_lightlevel)));
+}
+
 //
 // If player's view height is underneath fake floor, lower the
 // drawn ceiling to be just under the floor height, and replace
@@ -312,11 +324,11 @@ sector_t *R_FakeFlat(sector_t *sec, sector_t *tempsec, INT32 *floorlightlevel,
 			tempsec->lightlevel = s->lightlevel;
 
 			if (floorlightlevel)
-				*floorlightlevel = s->floorlightsec == -1 ? (s->floorlightabsolute ? s->floorlightlevel : max(0, min(255, s->lightlevel + s->floorlightlevel)))
+			*floorlightlevel = s->floorlightsec == -1 ? (s->floorlightabsolute ? s->floorlightlevel : max(0, min(255, s->lightlevel + s->floorlightlevel)))
 					: sectors[s->floorlightsec].lightlevel;
 
 			if (ceilinglightlevel)
-				*ceilinglightlevel = s->ceilinglightsec == -1 ? (s->ceilinglightabsolute ? s->ceilinglightlevel : max(0, min(255, s->lightlevel + s->ceilinglightlevel)))
+			*ceilinglightlevel = s->ceilinglightsec == -1 ? (s->ceilinglightabsolute ? s->ceilinglightlevel : max(0, min(255, s->lightlevel + s->ceilinglightlevel)))
 					: sectors[s->ceilinglightsec].lightlevel;
 		}
 		else if (heightsec != -1 && viewz >= sectors[heightsec].ceilingheight
@@ -356,11 +368,11 @@ sector_t *R_FakeFlat(sector_t *sec, sector_t *tempsec, INT32 *floorlightlevel,
 			tempsec->lightlevel = s->lightlevel;
 
 			if (floorlightlevel)
-				*floorlightlevel = s->floorlightsec == -1 ? (s->floorlightabsolute ? s->floorlightlevel : max(0, min(255, s->lightlevel + s->floorlightlevel)))
+			*floorlightlevel = s->floorlightsec == -1 ? (s->floorlightabsolute ? s->floorlightlevel : max(0, min(255, s->lightlevel + s->floorlightlevel)))
 					: sectors[s->floorlightsec].lightlevel;
 
 			if (ceilinglightlevel)
-				*ceilinglightlevel = s->ceilinglightsec == -1 ? (s->ceilinglightabsolute ? s->ceilinglightlevel : max(0, min(255, s->lightlevel + s->ceilinglightlevel)))
+			*ceilinglightlevel = s->ceilinglightsec == -1 ? (s->ceilinglightabsolute ? s->ceilinglightlevel : max(0, min(255, s->lightlevel + s->ceilinglightlevel)))
 					: sectors[s->ceilinglightsec].lightlevel;
 		}
 		sec = tempsec;
@@ -968,11 +980,10 @@ static void R_Subsector(size_t num)
 				&& ((viewz < heightcheck && (rover->fofflags & FOF_BOTHPLANES || !(rover->fofflags & FOF_INVERTPLANES)))
 				|| (viewz > heightcheck && (rover->fofflags & FOF_BOTHPLANES || rover->fofflags & FOF_INVERTPLANES))))
 			{
-				light = R_GetPlaneLight(frontsector, planecenterz,
-					viewz < heightcheck);
+				light = R_GetPlaneLight(frontsector, planecenterz, viewz < heightcheck);
 
 				ffloor[numffloors].plane = R_FindPlane(rover->master->frontsector, *rover->bottomheight, *rover->bottompic,
-					*frontsector->lightlist[light].lightlevel, *rover->bottomxoffs, *rover->bottomyoffs,
+					R_FloorLightLevel(rover->master->frontsector, *frontsector->lightlist[light].lightlevel), *rover->bottomxoffs, *rover->bottomyoffs,
 					*rover->bottomxscale, *rover->bottomyscale, *rover->bottomangle,
 					*frontsector->lightlist[light].extra_colormap, rover, NULL, *rover->b_slope, NULL);
 
@@ -1002,7 +1013,7 @@ static void R_Subsector(size_t num)
 				light = R_GetPlaneLight(frontsector, planecenterz, viewz < heightcheck);
 
 				ffloor[numffloors].plane = R_FindPlane(rover->master->frontsector, *rover->topheight, *rover->toppic,
-					*frontsector->lightlist[light].lightlevel, *rover->topxoffs, *rover->topyoffs,
+					R_CeilingLightLevel(rover->master->frontsector, *frontsector->lightlist[light].lightlevel), *rover->topxoffs, *rover->topyoffs,
 					*rover->topxscale, *rover->topyscale, *rover->topangle,
 					*frontsector->lightlist[light].extra_colormap, rover, NULL, *rover->t_slope, NULL);
 
diff --git a/src/r_defs.h b/src/r_defs.h
index ea697c7bb3958eaab830fcfd1393db92a2de6ef7..51cc0864652f0363eaf614fee7b23394a6b0dfc1 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -633,6 +633,11 @@ typedef struct
 	fixed_t scalex_top, scalex_mid, scalex_bottom;
 	fixed_t scaley_top, scaley_mid, scaley_bottom;
 
+	// per-wall lighting for UDMF
+	// TODO: implement per-texture lighting
+	INT16 light, light_top, light_mid, light_bottom;
+	boolean lightabsolute, lightabsolute_top, lightabsolute_mid, lightabsolute_bottom;
+
 	// Texture indices.
 	// We do not maintain names here.
 	INT32 toptexture, bottomtexture, midtexture;
diff --git a/src/r_plane.c b/src/r_plane.c
index 33e3aac1349faebb317d47c1f30ecec5d94a55ce..04272f8d317a790de6f658ddb2592072e50f7393 100644
--- a/src/r_plane.c
+++ b/src/r_plane.c
@@ -910,7 +910,7 @@ void R_DrawSinglePlane(visplane_t *pl)
 
 		if (pl->polyobj->translucency == 0 || (pl->extra_colormap && (pl->extra_colormap->flags & CMF_FOG)))
 			light = (pl->lightlevel >> LIGHTSEGSHIFT);
-		else
+		else // TODO: 2.3: Make transparent polyobject planes always use light level
 			light = LIGHTLEVELS-1;
 	}
 	else
@@ -952,7 +952,7 @@ void R_DrawSinglePlane(visplane_t *pl)
 
 				if ((spanfunctype == SPANDRAWFUNC_SPLAT) || (pl->extra_colormap && (pl->extra_colormap->flags & CMF_FOG)))
 					light = (pl->lightlevel >> LIGHTSEGSHIFT);
-				else
+				else // TODO: 2.3: Make transparent FOF planes use light level instead of always being fullbright
 					light = LIGHTLEVELS-1;
 			}
 			else if (pl->ffloor->fofflags & FOF_FOG)
diff --git a/src/r_segs.c b/src/r_segs.c
index 303de88807bcbbb7289b948e268c71c0d3a30914..637e528fe886636a1fcb9e5255d7a4768c3ff6b7 100644
--- a/src/r_segs.c
+++ b/src/r_segs.c
@@ -94,6 +94,32 @@ transnum_t R_GetLinedefTransTable(fixed_t alpha)
 	return (20*(FRACUNIT - alpha - 1) + FRACUNIT) >> (FRACBITS+1);
 }
 
+static INT16 R_SideLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light +
+		((side->lightabsolute) ? 0 : base_lightlevel);
+}
+
+/* TODO: implement per-texture lighting
+static INT16 R_TopLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_top +
+		((side->lightabsolute_top) ? 0 : R_SideLightLevel(side, base_lightlevel));
+}
+
+static INT16 R_MidLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_mid +
+		((side->lightabsolute_mid) ? 0 : R_SideLightLevel(side, base_lightlevel));
+}
+
+static INT16 R_BottomLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_bottom +
+		((side->lightabsolute_bottom) ? 0 : R_SideLightLevel(side, base_lightlevel));
+}
+*/
+
 // If we have a multi-patch texture on a 2sided wall (rare) then we draw
 //  it using R_DrawColumn, else we draw it using R_DrawMaskedColumn, this
 //  way we don't have to store extra post_t info with each column for
@@ -324,7 +350,7 @@ void R_RenderMaskedSegRange(drawseg_t *ds, INT32 x1, INT32 x2)
 			if ((colfunc != colfuncs[COLDRAWFUNC_FUZZY])
 				|| (rlight->flags & FOF_FOG)
 				|| (rlight->extra_colormap && (rlight->extra_colormap->flags & CMF_FOG)))
-				lightnum = (rlight->lightlevel >> LIGHTSEGSHIFT);
+				lightnum = R_SideLightLevel(curline->sidedef, rlight->lightlevel) >> LIGHTSEGSHIFT;
 			else
 				lightnum = LIGHTLEVELS - 1;
 
@@ -342,7 +368,7 @@ void R_RenderMaskedSegRange(drawseg_t *ds, INT32 x1, INT32 x2)
 	{
 		if ((colfunc != colfuncs[COLDRAWFUNC_FUZZY])
 			|| (frontsector->extra_colormap && (frontsector->extra_colormap->flags & CMF_FOG)))
-			lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT);
+			lightnum = R_SideLightLevel(curline->sidedef, frontsector->lightlevel) >> LIGHTSEGSHIFT;
 		else
 			lightnum = LIGHTLEVELS - 1;
 
@@ -798,9 +824,9 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor)
 
 			// Check if the current light effects the colormap/lightlevel
 			if (pfloor->fofflags & FOF_FOG)
-				rlight->lightnum = (pfloor->master->frontsector->lightlevel >> LIGHTSEGSHIFT);
+				rlight->lightnum = R_SideLightLevel(curline->sidedef, pfloor->master->frontsector->lightlevel) >> LIGHTSEGSHIFT;
 			else
-				rlight->lightnum = (rlight->lightlevel >> LIGHTSEGSHIFT);
+				rlight->lightnum = R_SideLightLevel(curline->sidedef, rlight->lightlevel) >> LIGHTSEGSHIFT;
 
 			if (pfloor->fofflags & FOF_FOG || rlight->flags & FOF_FOG || (rlight->extra_colormap && (rlight->extra_colormap->flags & CMF_FOG)))
 				;
@@ -818,18 +844,17 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor)
 	{
 		// Get correct light level!
 		if ((frontsector->extra_colormap && (frontsector->extra_colormap->flags & CMF_FOG)))
-			lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT);
+			lightnum = R_SideLightLevel(curline->sidedef, frontsector->lightlevel) >> LIGHTSEGSHIFT;
 		else if (fog)
-			lightnum = (pfloor->master->frontsector->lightlevel >> LIGHTSEGSHIFT);
+			lightnum = R_SideLightLevel(curline->sidedef, pfloor->master->frontsector->lightlevel) >> LIGHTSEGSHIFT;
 		else if (fuzzy)
 			lightnum = LIGHTLEVELS-1;
 		else
-			lightnum = R_FakeFlat(frontsector, &tempsec, &templight, &templight, false)
-				->lightlevel >> LIGHTSEGSHIFT;
+			lightnum = R_SideLightLevel(curline->sidedef, R_FakeFlat(frontsector, &tempsec, &templight, &templight, false)->lightlevel) >> LIGHTSEGSHIFT;
 
 		if (pfloor->fofflags & FOF_FOG || (frontsector->extra_colormap && (frontsector->extra_colormap->flags & CMF_FOG)));
 			else if (curline->v1->y == curline->v2->y)
-		lightnum--;
+			lightnum--;
 		else if (curline->v1->x == curline->v2->x)
 			lightnum++;
 
@@ -1463,7 +1488,7 @@ static void R_RenderSegLoop (void)
 			for (i = 0; i < dc_numlights; i++)
 			{
 				INT32 lightnum;
-				lightnum = (dc_lightlist[i].lightlevel >> LIGHTSEGSHIFT);
+				lightnum = R_SideLightLevel(curline->sidedef, dc_lightlist[i].lightlevel) >> LIGHTSEGSHIFT;
 
 				if (dc_lightlist[i].extra_colormap)
 					;
@@ -2650,7 +2675,7 @@ void R_StoreWallRange(INT32 start, INT32 stop)
 		//  use different light tables
 		//  for horizontal / vertical / diagonal
 		// OPTIMIZE: get rid of LIGHTSEGSHIFT globally
-		lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT);
+		lightnum = R_SideLightLevel(curline->sidedef, frontsector->lightlevel) >> LIGHTSEGSHIFT;
 
 		if (curline->v1->y == curline->v2->y)
 			lightnum--;
diff --git a/src/r_textures.c b/src/r_textures.c
index 6e01d56412f5663bf970baface676ebad6561cb1..b61ddb86f849f26c3e53980163c5a7f1ac2e94cd 100644
--- a/src/r_textures.c
+++ b/src/r_textures.c
@@ -1179,7 +1179,7 @@ static lumpnum_t W_GetTexPatchLumpNum(const char *name)
 	if (lump == LUMPERROR)
 	{
 		// Use whatever else you can find.
-		return W_GetNumForName(name);
+		return W_CheckNumForPatchName(name);
 	}
 
 	return lump;