Cheat mode:
Hold [Shift] and type one of the following codes to activate the corresponding cheat function.

Effect	Code
Wire frame graphics	wirewewaiting
Point graphics	whatsthepoint
Disable shading	flatbroke
Solid shading	solidasarock
Gouraud shading	gouraud
Invincibility	invunerability
Protect farm from jumping cows	oldmacdonald
Racing in the moon	flymetothemoon
All cheats active	haveall
Cows selectable as ships in arcade and multi-player modes	superdaisy
One shot kills	easyshoot
Unlimited smart bombs	supershoot
Unlimited lives	infinitelives
Unlimited weapons	infiniteweapons
Big ships	eroser
Extra tanks	tanksalot
Low gravity	catwalk
High gravity	fatwalk
Normal gravity	iweighnormal
Toggle textures	masteroftheuniverse
Enable in-game cheat keys	cheatkey

In-game cheat keys:
Press one of the following keys to activate the corresponding cheat function after using the cheatkey code.

Effect	Key
Easy shots	[F2]
Invincibility	[F3]
Unlimited lives	[F4]
Unlimited weapons	[F5]
Smart bomb	[F6]
Quit	[F7]
Save current game	[F8]
Reloads stored game	[F9]
Toggle frame wait	[F10]
Restart	[F11]

Cheat mode (command line):
Start the game with one of the following command line parameters to activate the corresponding cheat function.

Effect	Command line parameter
View frame rate	-framerate
Select screen resolution	-screenmode
Disable lens flare effects	-nolensflare
Disable fog	-nofog
Disable sky	-nosky
Disable MIP mapping	-nomipmap
Disable surround sound	-no3dsound
Disable shadows	-noshadows
Disable network support	-nonetwork

Cheat mode (alternate):
Type numberonedacrestreet at the main menu. Cheat options will now appear on the menu, including access to five bonus levels.