If you press up,up,down,down,left,right,left,right,white,black,X then the cheat menu will come up but there are actually 4 codes if you keep going down then another one will appear.
The codes are Blizzow mode where you can have all the powers at level 5 before you get them. Then there is god mode where you are invincible. Next is unlimited ammo where you can't run out of ammo but you will still have to reload and your power bar is unlimited. Last is the Uber mode where you have unlimited ammo and power bar but you don't have to reload.
Caution:sometimes when you enter the god mode and uber mode codes they can mess the game up temporarily like it will give god mode to one of the enemies or if you are hit once then you die instantly.
Added by: Lord Grunty Jun 8th 2005, ID#3830