i added a warthog skin to my bloodgulch mod and the skin showed up but when i tried to drive the hog, i didn't go anywhere
WHY?????
adding skins to an already modded level
Try replacing the bloodgulch.map with your backup bloodgulch.map. As long as you don't replace the bitmaps.map file your skins will still remain in all maps. If the hog works after you do this, then it's something wrong with your mod...maybe you changed the physics or model or something.
(Hope you saved your work earlier when it did work.
)

(Hope you saved your work earlier when it did work.

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