Monster House
Full health
While playing the game, hold L + R and quickly press A(3), Y.
Full secondary ammunition
While playing the game, hold L + R and quickly press Y(2), A(2).
All gun upgrades for all characters
While playing the game, hold L + R and quickly press B, Y, B, A, B, X, B(2).
All toy monkeys and art gallery images
While playing the game, hold L + R and quickly press Y, X, Y, X, B(3), A.
Completion bonuses
Successfully complete the game to unlock the Hard difficulty setting and the Ruby Key.
Overflowing toilet
When you get to the bathroom in Chapter 1, start flushing the toilet until it overflows. Stay in the bathroom and eventually you will go to heaven.