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Sony PSP - Family Guy cheats

Select any Stage:
On the menu screen, press Up, Left, Up, Left, Down, Right, Start to 
play on any stage.

Stewie Weapons:
Pick up different parts during the game then at the prompt, combine them.

Unlock Spread Shot 2 - Collect 100 Parts during the game
Unlock Shock Wave 2 - Collect 500 Parts during the game
Unlock Shock Wave 1 - Collect 400 Parts during the game
Unlock Rocket Launcher 2 - Collect 700 Parts during the game
Unlock Rocket Launcher 1 - Collect 500 Parts during the game
Unlock Plasma Ball 2 - Collect 200 Parts during the game
Unlock Plasma Ball 1 - Collect 100 Parts during the game
Unlock Plasma Artillery 2 - Collect 300 Parts during the game
Unlock Plasma Artillery 1 - Collect 200 Parts during the game
Unlock Hyper Plasma Ball 2 - Collect 400 Parts during the game
Unlock Hyper Plasma Ball 1 - Collect 300 Parts during the game
Unlock Heat Seeking Warheads - Collect 700 Parts during the game