About This Game
Can you afford a single mistake?
Margin of Error is a roguelite dungeon RPG where every battle is a numbers puzzle and every answer counts.
Princess Elyra is bound to Tinta, a cursed grimoire with a sharp tongue and a long memory. To break the curse she must lead her party across six regions full of monsters and the generals who command them.
Each enemy carries a target number. Hit it exactly with your cards and your attack lands. Miss it, and the dungeon makes you pay.
Count your way to victory
Math as Magic
Play number and operation cards to reach the enemy's target. Fight with smart combinations, not grinding.
Party vs. Enemies
Lead a team against groups of foes. Choose who to hit, when to take a risk, and when to play it safe.
Fog-of-War Labyrinth
Explore a hidden node map of fights, shops, forges, events and bosses. No two runs are the same.
Deck & Gear
Collect stamps, artifacts and modules. Forge and upgrade gear across rarities, from common to legendary.
Bosses with Rules
Each region's general changes how numbers work. Learn the twist, then beat it.
A Story that Remembers
Talk with Tinta and your companions, unlock codex entries, and find out what the curse really costs.