Enter these cheats at the title screen. To unlock these cheats, you must first earn 5 stars in Hardcore Mode for the corresponding scene numbers (shown in parens).
UGOTARMS Fully Equipped (Scenes 9 & 10)
THEYBOOM Helium Hunters (Scenes 7 & 8)
EVILEYES Invisibility (Scenes 17 & 18)
HELLSUIT Monkey Skin (Scenes 15 & 16)
PIGGSUIT Piggsy Skin (Scenes 19 & 20)
BUNYSUIT Rabbit Skin (Scenes 13 & 14)
HEALBACK Regeneration (Scenes 5 & 6)
URUNFAST Runner Mode (Scenes 1 & 2)
ALLRDEAF Silence Mode (Scenes 3 & 4)
UHITHARD Super Punch (Scenes 11 & 12)
Unlock Hard as Nails mini-game: Successfully complete levels 1 through 5 five a three star or greater rank.
Unlock Brawl Game mini-game: Successfully complete levels 6 through 10 five a three star or greater rank.
Unlock Monkey See, Monkey Die! mini-game: Successfully complete levels 11 through 15 five a three star or greater rank.
Unlock Time 2 Die mini-game: Successfully complete levels 16 through 20 five a three star or greater rank.
Shoot Locks: If you have a gun you can shoot the locks that usually require a crowbar to open.
Killing Piggsy: To finish off Piggsy, after you stab him three times go up the stairs and lure him onto the grate at the top level. The grate will bend the first time and he will run away. Lure him back upstairs and onto the grate for a second time and he will fall through.
Sawed-off shotgun in Born Again level: After you are let out of the execution room, you will soon find yourself in a basketball court where you have to defeat several gang members that are sent out after you. There is an opening in the fence around the court where you will see a posted sign reading "Vote Congressman Matthew R. Dione for Willington Mayor". Under the sign in the tall grass should be a sawed-off shotgun.
Easy five star rating in hardcore mode: Successfully complete the game in Fetish mode. Then, enable the "God mode" code and play the game in hardcore mode. You will be invincible. Execute everyone.