--- a/Game/src/duke3d.h
+++ b/Game/src/duke3d.h
@@ -68,7 +68,7 @@
 #define	CHOCOLATE_DUKE_REV_X		1
 #define CHOCOLATE_DUKE_REV_DOT_Y	0   // rev is: CHOCOLATE_DUKE_REV_X.CHOCOLATE_DUKE_REV_DOT_Y
 
-#define MAX_KNOWN_GRP 4
+#define MAX_KNOWN_GRP 5
 
 enum
 {
@@ -82,13 +82,14 @@
 #define CRC_BASE_GRP_SHAREWARE_13	0x983AD923
 #define CRC_BASE_GRP_FULL_13		0xBBC9CE44
 #define CRC_BASE_GRP_PLUTONIUM_14	0xF514A6AC
-#define CRC_BASE_GRP_ATOMIC_15		0xFD3DCFF1 
+#define CRC_BASE_GRP_ATOMIC_15		0xFD3DCFF1
+#define CRC_BASE_GRP_WORLD_TOUR		0x982AFE4A
 
 // implies  conVersion == 14 or conVersion == 15
 #define PLUTOPAK  (!VOLUMEONE && !VOLUMEALL) 
 #define VOLUMEONE (getGRPcrc32(0)==CRC_BASE_GRP_SHAREWARE_13)
 // VOLUMEALL = 1.3d full
-#define VOLUMEALL (getGRPcrc32(0)==CRC_BASE_GRP_FULL_13 || (conVersion == 13 && getGRPcrc32(0)!=CRC_BASE_GRP_SHAREWARE_13 && getGRPcrc32(0)!=CRC_BASE_GRP_PLUTONIUM_14 && getGRPcrc32(0)!=CRC_BASE_GRP_ATOMIC_15))
+#define VOLUMEALL (getGRPcrc32(0)==CRC_BASE_GRP_FULL_13 || (conVersion == 13 && getGRPcrc32(0)!=CRC_BASE_GRP_SHAREWARE_13 && getGRPcrc32(0)!=CRC_BASE_GRP_PLUTONIUM_14 && getGRPcrc32(0)!=CRC_BASE_GRP_ATOMIC_15 && getGRPcrc32(0)!=CRC_BASE_GRP_WORLD_TOUR))
 
 #define SCREENSHOTPATH "screenshots"
 
--- a/Game/src/global.c
+++ b/Game/src/global.c
@@ -53,6 +53,7 @@
 		{ CRC_BASE_GRP_FULL_13,			"FULL 1.3D     ", 26524524 },
 		{ CRC_BASE_GRP_PLUTONIUM_14,	"PLUTONIUM 1.4 ", 44348015 },
 		{ CRC_BASE_GRP_ATOMIC_15,		"ATOMIC 1.5    ", 44356548 },
+		{ CRC_BASE_GRP_WORLD_TOUR,		"WORLD TOUR   ", 44356548 },
 		// unknown:
 		{ 0,							"HACK/UNKNOWN  ", 0}
 	};
--- a/Game/src/game.c
+++ b/Game/src/game.c
@@ -8169,7 +8169,8 @@
 	if (	groupefil_crc32[0]==CRC_BASE_GRP_SHAREWARE_13 ||
 				groupefil_crc32[0]==CRC_BASE_GRP_FULL_13 ||
 				groupefil_crc32[0]==CRC_BASE_GRP_PLUTONIUM_14 ||
-				groupefil_crc32[0]==CRC_BASE_GRP_ATOMIC_15 )
+				groupefil_crc32[0]==CRC_BASE_GRP_ATOMIC_15 ||
+				groupefil_crc32[0]==CRC_BASE_GRP_WORLD_TOUR )
 	{
 		printf("GRP identified as: %s\n", grpVersion2char_from_crc(groupefil_crc32[0]));
 	}
--- a/Game/src/gamedef.c
+++ b/Game/src/gamedef.c
@@ -1667,7 +1667,8 @@
 				loadefs(filenam, mptr, 1); // force GRP con files
 			}
 		}
-		else if(conVersion != 15 && getGRPcrc32(0)==CRC_BASE_GRP_ATOMIC_15 && !getGRPcrc32(1))
+		else if(conVersion != 15 && (getGRPcrc32(0)==CRC_BASE_GRP_ATOMIC_15 ||
+			getGRPcrc32(0)==CRC_BASE_GRP_WORLD_TOUR) && !getGRPcrc32(1))
 		{
 			printf(	"\nYou are trying to use a v1.5 ATOMIC *.GRP with v1.4 or v1.3\n"
 					"external *.CON files. You may run in troubles by doing so and/or get\n"