ABOUT

Six math games. Open them and play.

NumeriDuel is a static little site with a simple goal: give you a genuinely good math puzzle in under two seconds — no download, no sign-up, no paywall, no ad breaks.

What you can play today

24 GameMake 24 from four cards. Daily, timed, or head-to-head. Sudoku 9×9Classic grid, three difficulty levels, pencil marks included. Sudoku 6×6The same reasoning, beginner-friendly board. Sudoku 4×4A gentle first grid — 1–4 in 2×2 boxes, made for young solvers. Equation PyramidFill the base so every brick computes upward.

Every puzzle is generated deterministically from a date seed, so everyone in the world gets the same daily board — that is what makes the daily race fair.

Three rules we stick to

No account required. Anything playable is reachable without logging in. Progress like preferences is kept locally in your own browser.
No ads, no trackers. We do not run advertising scripts or sell behavioural data.
No dark patterns. No coin pop-ups mid-puzzle, no countdown timers on paywalls.

The Duel family

NumeriDuel is one of three sibling sites: BoardDuel for board games and MemoryDuel for knowledge battles. Same design language, same no-nonsense philosophy.

Found something broken or want a board you miss? Tell us — bug reports genuinely shape what gets fixed next.