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• Endless Mode

Clear all the stages in Arcade Mode to play all stages endlessly without any bosses.

• Extra mode

Successfully complete Arcade mode to unlock the "Extra mode" option. Select that option to replay each stage at a higher difficulty.

• Replay previous levels

Successfully complete a level to unlock it for replay.

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• Bookmark or Share Space Invaders Extreme

Bookmark or Share Space Invaders Extreme on Sony PSP