Unlock Apocalypse:
Stay alive long enough for the screen to accumulate 20 baddies - then zap 'em.
Unlock Crystal Master:
Score 1,000,000 or more points in one game.
Unlock Crystal Ninja:
Score 10,000,000 points or more in one game at standard difficulty level or lower.
Unlock Crystal Rookie:
Score 10,000 points or more in one game at standard difficulty level or lower.
Unlock Immortal:
Reach 1,000,000 points without losing a life at standard difficulty level or higher.
Unlock Life-saver:
Have 30 lives in hand at standard difficulty level or higher.
Unlock Marathon Man:
Complete the first 60 waves in a single game.
Unlock Navigator:
Finish wave 20 without touching a mine or other obstacle at standard difficulty level or higher.
Unlock Nerves Of Steel:
Reach 1,000,000 without using a single smart bomb.
Unlock Smart-ass:
Have 30 smarts in hand at standard difficulty level or higher.
Unlock Speek Freak:
Complete the first wave in 5 seconds.
Unlock Treasure Hunt:
Collect 30 or more bonus crystals in a single game.
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