diff --git a/README.md b/README.md
index 07fc8d83f..dfea1128c 100644
--- a/README.md
+++ b/README.md
@@ -63,8 +63,8 @@ make -j$(nproc)
 ## How to install
 - Obtain an executable
 - Grab the assets from the [blankart-assets repo](https://codeberg.org/NepDisk/blankart-assets) 
-- Compile the pk3 by running buildmainpk3.bat on windows or buildmainpk3.sh on *nix.
-- Copy the generated pk3 into the folder `out/` and your compiled executable into a folder with the [SRB2Kart 1.6 assets](https://github.com/STJr/Kart-Public/releases/download/v1.6/AssetsLinuxOnly.zip) (such as an existing install).
+- Compile the pk3s by running buildall.bat on windows or buildall.sh on *nix.
+- Copy the generated pk3s from the folder `out/` and your compiled executable into a folder with the [SRB2Kart 1.6 assets](https://github.com/STJr/Kart-Public/releases/download/v1.6/AssetsLinuxOnly.zip) (such as an existing install).
 
 # Disclaimer
 BlanKart is in no way affiliated with Kart Krew Dev or Sonic Team Jr. This is just a project meant for fun. If you have any issues report to us not them.
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 79e4f9e97..9da56e004 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -81,12 +81,13 @@
 #include <tracy/tracy/Tracy.hpp>
 
 // Put hashes here to get them out of header hell.
-#define ASSET_HASH_MAIN_PK3     0x803483fc74253682
 #define ASSET_HASH_SRB2_SRB     0xf3ec1ea4d0eca4a9
 #define ASSET_HASH_GFX_KART       0xc91b0d43f5ba131f
 #define ASSET_HASH_TEXTURES_KART  0xb4211b2f32b6a291
 #define ASSET_HASH_CHARS_KART     0x1e68a3e01aa5c68b
 #define ASSET_HASH_MAPS_KART      0x38558ed00da41ce9
+#define ASSET_HASH_MAIN_PK3     0x803483fc74253682
+#define ASSET_HASH_MAPPATCH_PK3  0x16726c0303d699fb
 #ifdef USE_PATCH_FILE
 #define ASSET_HASH_PATCH_PK3     0x0000000000000000
 #endif
@@ -1199,6 +1200,7 @@ static void IdentifyVersion(void)
 	D_AddFile(startupiwads, va(pandf,srb2waddir,CHARSNAME));
 	D_AddFile(startupiwads, va(pandf,srb2waddir,MAPSNAME));
 	D_AddFile(startupiwads, va(pandf,srb2waddir,MAINNAME));
+	D_AddFile(startupiwads, va(pandf,srb2waddir,MAPPATCHNAME));
 #ifdef USE_PATCH_FILE
 	D_AddFile(startupiwads, va(pandf,srb2waddir,PATCHNAME));
 #endif
@@ -1489,6 +1491,7 @@ void D_SRB2Main(void)
 	W_VerifyFileHash(MAINWAD_CHARS, ASSET_HASH_CHARS_KART);
 	W_VerifyFileHash(MAINWAD_MAPS, ASSET_HASH_MAPS_KART);
 	W_VerifyFileHash(MAINWAD_MAIN, ASSET_HASH_MAIN_PK3);
+	W_VerifyFileHash(MAINWAD_MAPPATCH, ASSET_HASH_MAPPATCH_PK3);
 #ifdef USE_PATCH_FILE
 	W_VerifyFileHash(MAINWAD_PATCH, ASSET_HASH_PATCH_PK3);
 #endif
@@ -1500,6 +1503,7 @@ void D_SRB2Main(void)
 	wadfiles[MAINWAD_CHARS]->compatmode = true;
 	wadfiles[MAINWAD_MAPS]->compatmode = true;
 	wadfiles[MAINWAD_MAIN]->compatmode = false;
+	wadfiles[MAINWAD_MAPPATCH]->compatmode = false;
 #ifdef USE_PATCH_FILE
 	wadfiles[MAINWAD_PATCH]->compatmode = false;
 #endif
diff --git a/src/d_main.h b/src/d_main.h
index de7a9356f..69f5459b7 100644
--- a/src/d_main.h
+++ b/src/d_main.h
@@ -22,14 +22,15 @@ extern "C" {
 #endif
 
 // Store file nameres here for future reference else where.
-#define MAINNAME "main.pk3"
 #define SRB2NAME "srb2.srb"
+#define GRAPHICSNAME "gfx.kart"
 #define TEXTURESNAME "textures.kart"
+#define CHARSNAME "chars.kart"
 #define MAPSNAME "maps.kart"
+#define MAINNAME "main.pk3"
+#define MAPPATCHNAME "mappatch.pk3"
 #define PATCHNAME "patch.pk3"
 #define MUSICNAME "music.kart"
-#define CHARSNAME "chars.kart"
-#define GRAPHICSNAME "gfx.kart"
 #define SOUNDSNAME "sounds.kart"
 
 typedef enum
@@ -40,6 +41,7 @@ typedef enum
 	MAINWAD_CHARS,
 	MAINWAD_MAPS,
 	MAINWAD_MAIN,
+	MAINWAD_MAPPATCH,
 #ifdef USE_PATCH_FILE
 	MAINWAD_PATCH,
 #endif
diff --git a/src/d_netfil.c b/src/d_netfil.c
index f6ff1f830..d9d9be166 100644
--- a/src/d_netfil.c
+++ b/src/d_netfil.c
@@ -1402,18 +1402,19 @@ void PT_FileFragment(void)
 	filename = va("%s", file->filename);
 	nameonly(filename);
 
-	if (!strcmp(filename, MAINNAME)
-		|| !strcmp(filename, SRB2NAME)
+	if (!strcmp(filename, SRB2NAME)
 		|| !strcmp(filename, GRAPHICSNAME)
 		|| !strcmp(filename, TEXTURESNAME)
 		|| !strcmp(filename, CHARSNAME)
 		|| !strcmp(filename, MAPSNAME)
+		|| !strcmp(filename, MAINNAME)
+		|| !strcmp(filename, MAPPATCHNAME)
 		|| !strcmp(filename, PATCHNAME)
 		|| !strcmp(filename, SOUNDSNAME)
 		|| !strcmp(filename, MUSICNAME)
 		)
 	{
-		I_Error("Tried to download \"%s\"", filename);
+		I_Error("Tried to download base-game file: \"%s\"", filename);
 	}
 
 	filename = file->filename;
diff --git a/src/doomdata.h b/src/doomdata.h
index 2ce1f97ce..41377ed83 100644
--- a/src/doomdata.h
+++ b/src/doomdata.h
@@ -280,6 +280,7 @@ struct mapthing_t
 	UINT8 layer; // FOF layer to spawn on, see P_GetMobjSpawnHeight
 	mapUserProperties_t user; // UDMF user-defined custom properties.
 	mobj_t *mobj;
+	boolean patch;
 };
 
 #define ZSHIFT 4
diff --git a/src/p_setup.c b/src/p_setup.c
index 127891d12..b029536ba 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -137,6 +137,7 @@ node_t *nodes;
 line_t *lines;
 side_t *sides;
 mapthing_t *mapthings;
+static boolean basemaptyperemoval[4097];
 sector_t *spawnsectors;
 line_t *spawnlines;
 side_t *spawnsides;
@@ -815,6 +816,10 @@ static void P_SpawnMapThings(boolean spawnemblems)
 		if (!spawnemblems && mt->type == mobjinfo[MT_EMBLEM].doomednum)
 			continue;
 
+		// Don't spawn non-patch objects of this type if they are uneeded
+		if (mt->patch == false && basemaptyperemoval[mt->type] == true)
+			continue;
+
 		mt->mobj = NULL;
 
 		if (mt->type == mobjinfo[MT_LOOPENDPOINT].doomednum)
@@ -1413,6 +1418,7 @@ static void P_LoadThings(UINT8 *data)
 		memset(mt->script_stringargs, 0x00, NUM_SCRIPT_STRINGARGS*sizeof(*mt->script_stringargs));
 		mt->pitch = mt->roll = 0;
 		mt->layer = 0;
+		mt->patch = false;
 
 		mt->type &= 4095;
 
@@ -1545,6 +1551,39 @@ static boolean TextmapCount(size_t size, boolean patch)
 			CONS_Alert(CONS_WARNING, "This map patch is not compatible with the current map (checksum: " HASHFMT "). The patch may not work.\n", maphash);
 	}
 
+	// check for things to remove from the base map
+	if (patch)
+	{
+		tkn = M_TokenizerRead(0);
+		if (fastcmp(tkn, "basemaptyperemoval"))
+		{
+			tkn = M_TokenizerRead(0);
+			const char *typestr = tkn;
+			char *typetoken = strtok(typestr, " | ");
+			int i;
+
+			// check for types separated by pipes
+			// e.g. 300|2001|2004
+			while (typetoken != NULL)
+			{
+				i = atoi(typetoken);
+
+				if (i && !(i > 4096 || i < 0))
+				{
+					// Set type to removed.
+					basemaptyperemoval[i] = true;
+					CONS_Debug(DBG_SETUP,"Ignoring base mapthing type %d for patch\n", i);
+				}
+				else
+				{
+					CONS_Alert(CONS_ERROR, "Invalid mapthing type supplied for base mapthing removal.\n");
+				}
+
+				typetoken = strtok(NULL, " | ");
+			}
+		}
+	}
+
 	nummapthings = 0;
 	if (!patch)
 	{
@@ -3294,7 +3333,14 @@ static void P_LoadTextmap(boolean patch)
 	side_t     *sd;
 	mapthing_t *mt;
 
-	CONS_Alert(CONS_NOTICE, "UDMF support is still a work-in-progress; its specs and features are prone to change until it is fully implemented.\n");
+	if (!patch)
+	{
+		CONS_Alert(CONS_NOTICE, "UDMF support is still a work-in-progress; its specs and features are prone to change until it is fully implemented.\n");
+	}
+	else
+	{
+		CONS_Alert(CONS_NOTICE, "Patching current map.\n");
+	}
 
 	/// Given the UDMF specs, some fields are given a default value.
 	/// If an element's field has a default value set, it is omitted
@@ -3477,6 +3523,7 @@ static void P_LoadTextmap(boolean patch)
 		memset(mt->script_stringargs, 0x00, NUM_SCRIPT_STRINGARGS*sizeof(*mt->script_stringargs));
 		mt->layer = 0;
 		mt->mobj = NULL;
+		mt->patch = patch;
 
 		K_UserPropertiesClear(&mt->user);
 
@@ -8739,6 +8786,8 @@ boolean P_LoadLevel(boolean fromnetsave, boolean reloadinggamestate)
 
 	P_InitSlopes(); //Initialize slopes before the map loads.
 
+	memset(basemaptyperemoval, 0, 4097*sizeof(boolean));
+
 	if (!P_LoadMapFromFile())
 	{
 		TracyCZoneEnd(__zone);