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"Even? Odd? Forget the math!" Enter the Collatz Conjecture—mathematics' greatest unsolved mystery—reimagined as a high-speed roguelike action game. Play as "Ichi," the muscle-brained magical girl, teleporting between lanes to smash back incoming numbers with charge shots!
PC (Microsoft Windows) · Jun 28, 2026
Worldwide · Exact date · Full release · IGDB
Catalog sources
90 achievements available.
Defeat 1 enemy
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Defeat 300 enemies
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Reach 10 combo
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Reach 20 combo
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Reach 30 combo
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Reach 50 combo
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Reach 70 combo
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Reach 100 combo
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Reach 150 combo
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Reach 200 combo
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Reach 250 combo
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Defeat 10 enemies
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Reach 300 combo
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Deal 1000 damage
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Deal 2000 damage
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Deal 3000 damage
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Deal 4000 damage
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Deal 5000 damage
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Deal 7000 damage
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Deal 10000 damage
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Deal 15000 damage
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Deal 30000 damage
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Defeat 20 enemies
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Deal 100000 damage
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Collect 100 Col
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Collect 500 Col
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Collect 1000 Col
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Collect 2000 Col
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Collect 3000 Col
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Collect 5000 Col
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Collect 7000 Col
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Collect 10000 Col
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Collect 15000 Col
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Defeat 30 enemies
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Collect 20000 Col
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Login 1 day
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Login 3 days
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Login 5 days
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Login 10 days
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Login 15 days
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Login 20 days
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Login 30 days
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Login 40 days
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Login 50 days
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Defeat 40 enemies
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Login 100 days
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AutoParry 1 time
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AutoParry 2 times
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AutoParry 3 times
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AutoParry 4 times
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AutoParry 5 times
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AutoParry 6 times
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AutoParry 7 times
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AutoParry 8 times
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AutoParry 9 times
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Defeat 50 enemies
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AutoParry 10 times
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Die 1 time
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Die 3 times
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Die 5 times
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Die 10 times
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Die 15 times
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Die 20 times
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Die 30 times
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Die 40 times
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Die 50 times
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Defeat 100 enemies
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Die 100 times
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Buy 1 Grimoire
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Buy 2 Grimoires
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Buy 3 Grimoires
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Buy 4 Grimoires
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Buy 5 Grimoires
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Buy 6 Grimoires
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Buy 7 Grimoires
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Buy 8 Grimoires
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Buy 9 Grimoires
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Defeat 150 enemies
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Buy 10 Grimoires
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Reach Floor 1
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Reach Floor 3
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Reach Floor 5
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Reach Floor 7
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Reach Floor 10
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Reach Floor 13
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Reach Floor 16
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Reach Floor 18
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Reach Floor 19
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Defeat 200 enemies
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Reach Floor 20
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