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Design the wrong. Combine the errors. Prove what’s possible.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Train Fest ends
Complete each formula to reach the target error value and clear the stage.
The game offers 15 levels and 128 handcrafted stages designed to challenge your logic and creativity.
Errors breed more errors, and tiny deviations open new paths.
From these errors, beings known as Eri and Kori are born — and they never forget the rituals of their creation.
Recruit supporters to accelerate your progress toward the target error.
But beware — some number blocks come with their own constraints, adding unique conditions to your play.
Start with small calculations, and watch as they grow into a complex flow of logic and cascading errors!
Lowest tracked price: €2.06 (Jul 7, 2026) · current best: €5.89.
Right now the cheapest offer for OFF BY is €5.89 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for OFF BY is €2.06 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
Create a free price alert on this page and KingsPrice will email you when OFF BY drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
