At main menu, type NUMBERONEDACRESTREET. You will now have access to several cheat options.

Now during play type (case sensitive):

FLATBROKE Turns off shading
FLYMETOTHEMOONRacing on the moon
GOURAUD Turns on gouraud shading
HAVEALL All items
INFINITELIVES Infinite lives (duh!)
INFINITEWEAPONS Infinite weapons (that was a tough one!)
MASTEROFTHEUNIVERSEToggles textures
OLDMACDONALDProtect farm from jumping cows
SOLIDASAROCK Invincibility
SUPERDAISYOne shot kills
WHATSTHEPOINTDot texture mode 
WIREWEWAITING Textures off

Thanks to Revolution readers Tim “Cloud 99”, Wilmar Luna, Randy Russo, boris

of S.M.S, Joí£o Pedro, Luis Miguel, Erik Sanchez, and Robbert Uges!