Give it a try
Grab the latest release from GitHub. Unzip, run the exe — no installer, no .NET to install separately, nothing extra.
Download latestA small Windows app for practicing mental math. No account, no internet, just you and the numbers.
Free · Open source · Offline
No internet, no account, no telemetry. Just install and play. Your saves stay on your machine.
From easy++ (1–10) to insane (100–1000). Hard and insane are locked until you earn enough coins.
Every correct answer gives XP and coins. Spend coins in the shop, level up as you practice.
See how many problems you've solved, broken down by operation. Simple and honest tracking.
Unlock harder difficulties and cosmetic items. No pay to win — everything costs coins you earn.
Built with C# and WinForms. The whole thing is on GitHub if you want to dig in or contribute.
Grab the latest release from GitHub. Unzip, run the exe — no installer, no .NET to install separately, nothing extra.
Download latest