Steam

Zero Sum

Also known as Zero Sum, steam:4546380, zero sum

A hand-drawn twin-stick roguelite where every bullet is an equation and every enemy is a number. Subtract, divide, root, modulo. 7 operators, 22 firing modes, 9 bosses, 80+ upgrades. Reduce them all to zero. No health bars, just raw arithmetic violence. You failed math class. Math didn't forget.

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Last update

18 Jun 2026

Original sources

Latest update

AnnouncementPublished 14d ago

New experimental demo boss, steam leaderboards & small fixes

Added an experimental demo boss with Steam Leaderboards Changes to Math Paper map (Conveyor mode) — now plays differently from the standard Writing Paper mode Fixed some grading inconsistencies

3 changesFixGameplay

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Latest updates

Update history

Browse past updates and patch notes for this game.

4updates

June 2026
Demo: additional boss behaviours, new upgrade nodes, loadout additionsSummation Serpent head now charges the player when no more segments are to be cleared can be stunned by clearing the number that breaks off the serpent Factorial Factory now spawns smaller and much slower factorials on…Announcement3 changesGameplayMaps18d ago
Minor Summation Serpent and Sieve Spider boss fixesSieve Spider now uses the correct number designs as follows: "spiky" numbers only for invincible numbers "glitched" numbers only for weakpoints (legs) NEW: "hatched" numbers instead of "spiky" for all sieve numbers. as…Announcement3 changesFixGameplay22d ago
Zero Sum Demo Playable During Steam Next Fest!Gear up for some raw arithmetic violence! In Zero Sum, every bullet is an equation and every enemy is a number. No health bars. No hit points. Just pure mathematical combat in a hand-drawn twin-stick shooter that looks…Announcement3 changesBalanceMaps26d ago

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