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Codes
From the main menu go into the extras menu and using either the control stick or the D-pad input the following codes:

Code - Effect :
Down, Left, Up, Left, Right, Down, Left, Up - All Multiplayer Skins
Right, Left, Right, Left, Down, Down, Up, Up - Paintball Mode

One Life Mode
Complete all stages on Hard difficulty

Harpoon:
When you have a Harpoon and are trying to kill someone else with it, shoot the ground around their feet. This is much easier then trying to shoot the person's body. You may even kill more than one. Note: Do not try this with other weapons such as pistols, machine guns, commandos, etc.

Multi-player mode: Shields:
When your opponent uses his or her shield, hit them with your stun power. They will be unable to hack out of it because their shield drains all of their power. Then, pick them up and throw them. When your opponent uses MRI Vision, use your shield. You will become invisible to them. Try different combinations of weapons to see which works best for your fighting style.