Death Jr. (PSP)

All Weapon Upgrades
Pause the game, then hold L + R and press Up(2), Down(2), Left, Right, Left, Right, X, Circle.

Invincibility
Pause the game, then hold L + R and press Up(2), Down(2), Left(2), Right(2), Square, Triangle. If you entered the code correctly, "Can't touch this" will appear when you exit the start menu.

Ledge Grabs & Combos
In the room with Smith and Weston, go up to the door that you exit through. You can perform an unlimited amount of ledge grabs. If you shoot one of the computers in the room before you begin the ledge grabs you can perform an unlimited combo

Avoid Lava Damage
In the Dead Guppy & The Seep Levels, when you fall in the lava, you will take a lot of damage so. Use the "Scythe Hop" continuously to reach a stone to grab yourself with Square.

Refill Ammunition
Pasuse game play, then hold L+R and press Up(2), Down(2), Left(2), Right(2), Square, Triangle. When you exit the start menu, "can't touch this" will apper to confrim correct code entry.

Scythe Combo Moves
After you collect four Weapon Widgets, pay Smith & Weston to unlock "More Scythe Moves" Then, use the following combinations:

Circle Spin:
Press Square(2), Triangle.

Uppercut:
Press Square(2), X.

Dive Attack:
Press x, Square

Powerful Combo Hit:
Press Square(3).