diff --git a/src/p_saveg.c b/src/p_saveg.c
index 137b4ffd0..eb49e9730 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -655,6 +655,8 @@ static void P_NetArchiveWorld(void)
 				WRITEINT32(put, ss->firsttag);
 				WRITEINT32(put, ss->nexttag);
 			}
+			if (diff3 & SD_MIDMAP)
+				WRITEINT32(put, ss->midmap);
 
 			if (diff3 & SD_COLORMAP)
 			{
diff --git a/src/p_setup.c b/src/p_setup.c
index b503b6a58..d8156992e 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -1470,6 +1470,7 @@ static void P_LoadRawSideDefs2(void *data)
 		{
 			case 63: // variable colormap via 242 linedef
 			case 606: //SoM: 4/4/2000: Just colormap transfer
+			case 447: // Change colormap of tagged sectors! -- Monster Iestyn 14/06/18
 				// SoM: R_CreateColormap will only create a colormap in software mode...
 				// Perhaps we should just call it instead of doing the calculations here.
 				if (
diff --git a/src/p_spec.c b/src/p_spec.c
index 5135676ab..21380584b 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -3250,6 +3250,15 @@ static void P_ProcessLineSpecial(line_t *line, mobj_t *mo, sector_t *callsec)
 			}
 			break;
 
+		case 447: // Change colormap of tagged sectors!
+			// Basically this special applies a colormap to the tagged sectors, just like 606 (the colormap linedef)
+			// Except it is activated by linedef executor, not level load
+			// This could even override existing colormaps I believe
+			// -- Monster Iestyn 14/06/18
+			for (secnum = -1; (secnum = P_FindSectorFromLineTag(line, secnum)) >= 0 ;)
+				sectors[secnum].extra_colormap = line->frontsector->extra_colormap;
+			break;
+
 		case 448: // Change skybox viewpoint/centerpoint
 			if ((mo && mo->player && P_IsLocalPlayer(mo->player)) || (line->flags & ML_NOCLIMB))
 			{
diff --git a/src/r_defs.h b/src/r_defs.h
index 8dd34cd15..77b56bd30 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -393,6 +393,7 @@ typedef struct sector_s
 
 	// these are saved for netgames, so do not let Lua touch these!
 	INT32 spawn_nexttag, spawn_firsttag; // the actual nexttag/firsttag values may differ if the sector's tag was changed
+	INT32 spawn_bottommap, spawn_midmap, spawn_topmap;
 
 	// offsets sector spawned with (via linedef type 7)
 	fixed_t spawn_flr_xoffs, spawn_flr_yoffs;