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Margin of Error
Princess Elyra is bound to a cursed grimoire. Lead her party through six monster-filled regions in this roguelite dungeon RPG, where every attack is a numbers puzzle: play number and operation cards to hit each enemy’s exact target. Miss it, and the dungeon makes you pay.

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Features
Languages:
Interface Full Audio Subtitles
English ✔ ✔
Indonesian ✔ ✔
Japanese ✔ ✔
Russian ✔ ✔
Simplified Chinese ✔ ✔

Coming Soon To Early Access

The developers of this game intend to release as a work in progress, developing with the feedback of players.

Note: Games in Early Access are not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Margin of Error is built around one idea: every count you make answers the enemy's target number. A system like that gets better the more people play it. We want real players to help us tune the math cards, gear and difficulty curve before we call the game finished. The core game is already playable from start to end, so Early Access lets us grow it with the community instead of guessing behind closed doors.”

Approximately how long will this game be in Early Access?

“We expect Early Access to last about 6–12 months, depending on player feedback and how much content we add.”

How is the full version planned to differ from the Early Access version?

“We plan to:
- Finish Princess Elyra and Tinta's story, including a fully illustrated prologue and more story scenes between regions.
- Add more math cards, functions, stamps, artifacts and gear, and more forge and blacksmith options.
- Add more enemies, bosses and node-map events across the six regions.
- Rebalance the economy and difficulty, especially the late-game coin flow.
- Add Steam Achievements, more music and sound, and quality-of-life improvements.
- Add more languages if there is enough demand.
- Add PvP Multiplayer (Tentative)”

What is the current state of the Early Access version?

“The game is fully playable. It includes:
- Party-vs-enemies combat built on counting and math cards
- All six regions on a fog-of-war labyrinth map, with an intro and ending cutscene for each region
- Bosses, loot, gear with rarities, a forge, a blacksmith, a shop and a camp hub
- Three save slots, a codex, a tutorial, and an adaptive soundtrack
- English and Indonesian text

Balancing is still in progress, and some story scenes, including the prologue, are in an early staged form. Expect rough edges and changes.”

Will the game be priced differently during and after Early Access?

“We plan to gradually raise the price as we add new content and features. Players who join during Early Access will get the game at its lowest price.”

How are you planning on involving the Community in your development process?

“We'll read the Steam discussions, reviews and our Discord closely, and we'll post regular devlogs and patch notes that explain what changed and why. Player feedback on difficulty, card balance and readability will directly shape our tuning passes. We also plan to run polls or community tests before bigger changes.”
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About This Game

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.

Build your deck and your gear: Collect stamps, artifacts and modules. Forge and upgrade gear across rarities, from common to legendary.

Bosses with their own rules:

Each region's general changes how numbers work. Learn the twist, then beat it.

Easy to learn and deep to master. Whether you love numbers or fear them, Margin of Error turns quick thinking into your strongest spell.

System Requirements

Windows
macOS
    Minimum:
    • OS: Windows 10+ (64-bit)
    • Processor: Intel Core i3-2100 (2.0 GHz) or AMD FX-4100 (2.0 GHz)
    • Memory: 4 GB RAM
    • Graphics: DirectX 10 compatible graphics card with 512 MB VRAM
    • Storage: 500 MB available space
    • Sound Card: DirectX compatible sound card
    Recommended:
    • OS: Windows 10+ (64-bit)
    • Processor: Intel Core i5-4460 (3.2 GHz) or AMD Ryzen 3 1200 (3.1 GHz)
    • Memory: 8 GB RAM
    • Graphics: DirectX 11 compatible graphics card with 1 GB VRAM
    • Storage: 1 GB available space
    • Sound Card: DirectX compatible sound card
* Starting February 15, 2024, the Steam Client will no longer support 32-bit games or macOS 10.14 or lower.