Activate the following cheats by entering the corresponding codes:

CHEAT FUNCTION - CHEAT CODE
Transforms pigs - bacon
Transforms trailers - toast
More credits1 - cheatercheaterwimpwimp
View credits2 - kiev
Slow mode - slow
Fast mode - fast or breakfast
Rabbit - wolfdog or carrot
Enable debug mode - debug
Enable Z mode in debug - zon
Disable Z mode in debug - zoff
Skydiver; use middle or closest view - uspa87419
Entire programming team - spootystruct
NOTE 1: Enter this code after game play is paused.
NOTE 2: Windows version only.

Hold SHIFT and click on grass. Drag the mouse and the area you highlighted will turn black. Release the mouse button, and it should be grassy in that area.