Cheat...
	Controller Debug ...
	Dnkroz...
	Level Select ...
	No Monsters ...

All weapons: pause the game and press Z,X,X,Z,Y,X,Y.
God mode: pause the game and press X,Z,Z,X,Y,X,Y,Z,Y.

At the Main Menu, hold X + Y + Z + L + R until the phrase Info Mode: On appears.

This is a god mode cheat. You just write it without pausing the game or anything.

Press X, Y, Z, Z, Y, X, Y, Z, Y at the main options screen.

Pause game play and press Z, Z, X, X, Y, X, Y, X, Z at the skill level selection screen.