C++20 · WebAssembly · verified competitions
Learn by playing the system.
Every game runs in your browser. Public scores are accepted only after the server regenerates the challenge and verifies the complete replay.
Today’s challenge
Can you set the first high score?
The leaderboard resets its daily view at midnight UTC.
Ledger Reflex
Train debit, credit and complete journal-entry recognition against the clock.
Play and challenge the leaderboard →Mental arithmetic · 60 secondsSum Rush
Hold a running total through addition, subtraction, multiplication and exact division.
Play and challenge the leaderboard →Systems thinking · 90 secondsNode Forge
Build the shortest valid calculator workflow for real business and operating decisions.
Play and challenge the leaderboard →Finance strategy · WebAssemblyFUff Capital
Trade fictional assets, travel, buy property and build a company in the original MW SysArc simulation.
Play FUff Capital →No account is required to play any challenge.
Seeds and answer replays are recalculated before publication.
Submitting a score publishes only the member’s first name.