Here are some cheats and tips for the game Monster House.
Full health:
Hold L + R and quickly press A(3), Y during game play.
All gun upgrades for all characters:
Hold L + R and quickly press B, Y, B, A, B, X, B(2) during game play.
Refill secondary weapon ammunition:
Hold L + R and quickly press Y(2), A(2) during game play.
All Toy Monkeys and Art Gallery images:
Hold L + R and quickly press Y, X, Y, X, B(3), A during game play.