Successfully complete levels 1 through 5 five a three star or greater rank.
Brawl Game mini-game
Successfully complete levels 6 through 10 five a three star or greater rank.
Monkey See, Monkey Die! mini-game
Successfully complete levels 11 through 15 five a three star or greater rank.
Time 2 Die mini-game
Successfully complete levels 16 through 20 five a three star or greater rank.
Opening gates
When on a level that requires a crowbar to open a gate, just shoot the lock with a gun. You can now walk through the gate.
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. Make sure that you are also not on the grate or you will suffer a similar fate as Piggsy.
Born Again level: Early sawed-off shotgun
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.
Mouth Of Madness level: Bonus item
In this level, you must kill the smiley hunter on the tower and bring his body to the guard room. Kill the hunter on the tower and make sure to cut off his head. However, do not bring his body to the guard room (just his head). An intermission sequence will show you entering the guard room with only the head. Starkweather will say "For bringing this head I will leave you a little gift in the next location". Look around for the unknown item.
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. If you are seen, run into the shadows, execute him, then run through the level.
Cheat Codes
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).