Stay alive long enough for the screen to accumulate 20 baddies - then zap 'em.
Score 1,000,000 or more points in one game.
Score 10,000,000 points or more in one game at standard difficulty level or lower.
Score 10,000 points or more in one game at standard difficulty level or lower.
Reach 1,000,000 points without losing a life at standard difficulty level or higher.
Have 30 lives in hand at standard difficulty level or higher.
Complete the first 60 waves in a single game.
Finish wave 20 without touching a mine or other obstacle at standard difficulty level or higher.
Reach 1,000,000 without using a single smart bomb.
Have 30 smarts in hand at standard difficulty level or higher.
Complete the first wave in 5 seconds.
Collect 30 or more bonus crystals in a single game.
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