For every hour of game time, you'll earn one additional credit (continue). Initially, you'll start off with only three credits. Once you've earned nine credits, you'll unlock infinite credits after that.
Complete a level on hard difficulty, and you'll unlock that level in practice mode.
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You can submit new cheat codes for this game using our Cheat Submission Form.
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If you see a non-working or fake code in the list above, let us know by using our Problem Submission Form.