Unlimited Ammo
First, pause the game during a mission or whatever, then enter the following: R1, CIRCLE, L1, SQUARE, CIRCLE, R1, RIGHT, RIGHT, CIRCLE, RIGHT. You should be booted to the main menu if it worked. From here go to the "Extras" menu and you should see an "Unlimited Ammo" option.

Level Select
Make sure you have two controllers plugged in, and head over to the level select screen. Hold the UP button on the second controller, and then press START, SELECT, SELECT, SQUARE. All the levels should be unlocked.

All Artwork
Pause the game, then press R1, Square, R1, Square, Circle, Left, R1, Left, Left. The game will return to the main menu if entered correctly. Enter the "Extras" menu to see an option to unlock all artwork.

Gameplay Cheats
Complete Easy Difficulty: Big Head Mode
Complete Hard Difficulty: Big N' small Mode
Complete Normal Difficulty: Dead Eye Mode
Complete Easy Difficulty: Head Shot Mode
Complete Easy Difficulty: Richochet All Mode
Complete Easy Difficulty: Richochet Mode
Complete Normal Difficulty: Shrink Shot Mode

Easter Egg: Big Red Apple
In the Russian campaign, right at the beginning of the mission Operation Little Saturn, turn left and find a scraggly tree all by itself along the embankment. Go over/through the embankment just right of the tree, and then turn left and find a road that leads away from the rest of the board. After a while you will see a huge red apple in the distance. You can drive right through it to find something else that doesn't belong in a WWII game =)

Easter Egg: Teddy Bear
In the stage "Surrender at Aachen" (Western Front), you will be in an enemy occupied house right from the start. The small room directly across from where you start from has a small teddy bear you may acquire with that will restore your health.

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