Family Guy Cheats - PSP

Cheat Mode
Enter the following codes at the menu screen:

[Up], [Left], [Up], [Left], [Down], [Right], [Start] - Unlock all stages

Unlock Stewie Weapons
Collect different parts during the game, and then combine them at the prompt:

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