String Theory achievements

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Sound Sticktoitiveness
Complete 10 level-20 puzzles in Endless Chaos mode.
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Perfect Pitch
Complete level 40 without using a power-up.
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First Chair
Complete levels 21 through 25 in Time-Attack Chaos mode.
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Captain Chaos
Complete Level 15 in Chaos mode.
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Laser Disc Hero
Complete 10 level-35 puzzles in Endless mode.
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Aural Endurance
Complete 10 level-5 puzzles in Endless Chaos mode.
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Admiral Anarchy
Complete Level 20 in Chaos mode.
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Composer
Complete all Time-Attack Chaos challenges. Unlocks the Zither instrument.
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Forza
Complete Level 15 in Time-Attack mode.
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Shiver Me Timbres
Complete levels 6 through 10 in Time-Attack Chaos mode.
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If You Like it, Then...
Complete levels 39 & 40 with the Saturn BGM. Unlocks the Crybaby Keys instrument.
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Conductor
Complete levels 36 through 40 in Time-Attack Chaos mode.