Margin of Error

Margin of Error is a roguelike deck-builder fused with math puzzles, where every card you play could lead to triumph… or total failure. Build equations with numbers and operators to defeat enemies, withstand unique debuffs, and climb your way to the highest score. Will you trust your logic—or gamble on luck?

BUILD YOUR DECK

You will start with a variety of math cards that appear randomly—ranging from numbers 0–9, basic operators like +, –, ×, ÷, to special cards such as π and square roots. Each run can deal you a different combination. At later stages, you can even build formulas shaped like squares, triangles, and even the golden ratio to unleash greater damage.

FACE UNIQUE ENEMIES

Enemies don’t just have HP—they fight back with debuffs that twist your calculations. Every battle feels different.

STAMPS & MODULES

Power up your run with Stamps (permanent buffs) and Modules (situational bonuses). Will you build a stable equation engine, or gamble on high-risk, high-reward combos?

THE GACHA GAMBLE

Between rounds, you’ll face the temptation of gacha. Take the risk for a chance at epic effects—or pay the price when luck turns against you. It’s not just math; it’s courage under pressure.

DAILY CHALLENGES

Each day brings a brand-new puzzle seed to solve. Test your skills against fresh layouts, then compare your results with players around the world through leaderboards.

SHOW YOUR SKILL

Prove your mastery with a variety of achievements. From simple combos to outrageous, brain-melting equations, every milestone shows you truly own the Margin of Error.