STEEL REIGN

- INVINCIBLE:
AT MAIN MENU, PRESS L2, L1, R2, O, SQU, O, O, L1, L2, L1.

- SECRET LEVEL:
AT MAIN MENU, PRESS L1, L2, L1, L2, R2, R1, SQU, O, SQU, SQU.

- ALL TANKS OPEN:
AT MAIN MENU, PRESS L1, L2, L1, O, SQU, O, O, L2, L1, R2.

These codes have been tested
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