Ground Tilez

Tile Properties/Attributes: Clear
Tile 1 2 3 4 5 6 7 8
267 267 267 267 267 267 267
268 268 268 268 268 268 268
269 269 269 269 269 269 269 269
All three of these Tilez exist in Area 4 (High On Sweetz);
267 appears in Area 2 (Gruntziclez);
268 appears in Area 5 (High Rollerz).

In the graphicz setz where there is no image, the Tile numberz are Invalid, and will cause Gruntz to fail.
I have no idea why these exist, especially in Area 5, because it looks like it should be a Solid Tile.