Spy Hunter 2 Cheats

Invincibility
Pause the game, then press L1, L1, L1, R2, L1, R1, R1, L1, R2.

Infinite Ammo
Pause the game, then press R1, L1, R2, R2, L2, R1, L1, R2, L2.

All Missions and Weapons
At the main menu, press L1, R2, L2, R1, R1, L2, R2, L1.

Unlock All 2 Player Levels
On the agent name screen type your name as - agentptwo - press OK, it will disappear then type any name then OK and you will have all 2 player areas.

Train hint
When you get to the train level On 2 player campaign. Use the shield to get behind one of the side ball guns destroy it and that is a safe place for player 2 to shoot the train with the turret and the EMP device cant get to you.