Finish the game without using a continue before Mission 5 and you'll play a bonus mission during the ending. However in the Japanese version, this bonus mission will appear only if you beat the game on Hard mode. That means you will have to beat the game twice.
Play on hard mode (Japanese version only)
Just beat the game and the hard mode will be available.
Unlockable How to Unlock Hard mode Beat the game
Contributed By: hydao.
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