All weapons
Press [Start] to pause game play, then hold [L] + [R], then enter [Up], [Up], [Down], [Down], [Left], [Right], [Left], [Right], [X], [O].
Level select
Press [Start] to pause game play, then hold [L] and press [Up]x4, [Down]x4, [X]2.
Advanced Training level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [X], [Down], [Square].
Basic Training level
Press [Start] to pause game play, then hold [L] and press [Up], [Triangle], [Up], [X], [Down], [X], [Down], [X], [Down], [X].
Big Trouble in Little [Down]town level
Press [Start] to pause game play, then hold [L] and press [Up], [Triangle], [Down], [X], [Down], [X], [Down], [X], [Down], [X].
Bottom of the Bell Curve level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [X], [Down], [Triangle].
Burn it [Down] level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Up], [Triangle], [Down], [X], [Down], [X], [Down], [X].
Final Battle level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [Triangle], [Up], [X].
Growth Spurt level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [X], [Up], [X].
Happy Trails Insanitarium level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [Triangle], [Up], [X], [Down], [X], [Down], [X].
Higher Learning level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [Triangle], [Down], [X].
How a Cow Becomes a Steak level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [Triangle], [Down], [X], [Down], [X].
Inner Madness Level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Up], [Triangle], [Down], [X], [Down], [X].
Into the Box level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Up], [Triangle], [Down], [X].
Moving on Up level
Press [Start] to pause game play, then hold [L] and press [Down], [Triangle], [Up], [X], [Down], [X], [Down], [X], [Down], [X].
My House level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [Triangle], [Down], [X], [Down], [X], [Down], [X].
Seep's Hood level
Press [Start] to pause game play, then hold [L] and press [Down], [Triangle], [Down], [X], [Down], [X], [Down], [X], [Down], [X].
Shock Treatment level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [Triangle], [Up], [X], [Down], [X].
The Basement
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [X], [Up], [Triangle].
The Burger Tram level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Up], [X], [Down], [X].
The Corner Store level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Up], [X], [Down], [X], [Down], [X], [Down], [X].
The Museum level
Press [Start] to pause game play, then hold [L] and press [Up], [X], [Down] [X], [Down], [X], [Down], [X], [Down], [X].
Udder Madness level
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Up], [X], [Down], [X], [Down], [X].
Refill ammunition
Press [Start] to pause game play, then hold [L] and press [Triangle]x2, [X]x2, [Square], [Circle], [Square], [Circle], [Down], [Right].
Unlimited ammunition
Press [Start] to pause game play, then hold [L] and press [Triangle]x2, [X]x2, [Square], [Circle], [Square], [Circle], [Right], [Down].
Invincibility
Press [Start] to pause game play, then hold [L] and press [Up]x2, [Down]x2, [Left]x2, [Right]x2, [Square], [Triangle]. When you exit the start menu, "Can't touch this" will appear to confirm correct code entry.
Disable gates
Press [Start] to pause game play, then hold [L] and press [Up], [Left], [Down], [Right], [Left], [Triangle], [Square], [X], [Circle], [Square].
Increased assist stocks
Press [Start] to pause game play, then hold [L] and press [Up]x2, [Down]x2, [Up], [Right], [Down], [Left], [X]x2.
Increased total health
Press [Start] to pause game play, then hold [L] and press [Up]x2, [Down]x2, [X], [Circle], [Triangle], [Square], [X]x2.
One more weapon widget
Press [Start] to pause game play, then hold [L] and press [Right], [Up], [Down], [Up], [Triangle], [Up], [Left], [Square], [Triangle], [Right].
Extra violent kills
Press [Start] to pause game play, then hold [L] and press [Circle], [Left], [X], [Up], [Square], [Right], [Triangle], [Down], [X], [Up].
Big head mode
Press [Start] to pause game play, then hold [L] and press [Triangle], [Circle], [X], [Square], [Triangle], [Up], [Right], [Down], [Left], [Up].
Big scythe mode
Press [Start] to pause game play, then hold [L] and press [Triangle], [Square], [X], [Circle], [Triangle], [Up], [Left], [Down], [Right], [Up].
Crazy Scythe trails
Press [Start] to pause game play, then hold [L] and press [Triangle], [Up], [Circle], [Right], [X], [Down], [Square], [Left], [Triangle], [Up].
Random color Scythe trails
Press [Start] to pause game play, then hold [L] and press [Down], [X], [Down], [X], [Down], [X], [Down], [X], [Down], [X].
Seep freed movie
Press [Start] to pause game play, then hold [L] and press [Left]x2, [Right]x2, [Left], [Right], [Left], [Right], [X]x2.