Cheat Code entry screen
Press and hold L1 + L2 + R1 + R2 + Left + Circle + Triangle + Square and press X at the options Stamper menu.
Cowboy Hat
When you kill Big Bart in the first level his hat will be laying there waiting to be put on. If you get killed you will lose the hat.
Invulnerability
At the Cheat Codes screen, enter TANKODOOM.
Level select
Press and hold L1 + L2 + R1 + R2 + Left + Circle + Select at the new game Stamper menu
Low gravity
Enter FEATHER at the cheat codes screen.
View Ending FMV
Enter "FMVVVV" at the cheat codes screen.
View Game Over FMV
Enter "FMVUUU" at the cheat codes screen.
View Tiny Tank Music Video FMV
Enter "FMVWWW" at the cheat codes screen.