Codes cheats for Thunderstrike

Thunderstrike - Game cheats, tips and tricks for Playstation 2

Level Select
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Set the Vibration level in options to 1 and both
SFX and Music to 0.
Then hold L1 + L2 + R1 + R2 + Circle + Square.
A message will confirm you have done it right.

Ending bonuses
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Successfully complete the game under the hard difficulty
setting. The maniac difficulty setting and a bonus chopper
and will now be unlocked.
The bonus chopper flies, turns, climbs, descends,
and shoots faster.