One contest. One shot. Everyone plays it.
Everyone playing today gets the identical problems, scored on the server. No account needed to compete — sign up when you want to keep it.
- No account needed
- One run a day
- About three minutes
Top of the board
Full leaderboardThis week
- 1spry-falcon-2991,208
- 2neat-ibex-731387
- 3spry-heron-351143
Daily Synchronized Contest
One ramped contest a day, generated deterministically so every player worldwide gets the identical problems. One run each, on a fair public board.
Explore30s – 10mSprint the Clock
One clock, no last problem. Answer as many as you can in 30 seconds to 10 minutes, then send the identical run to somebody who thinks they are faster.
Explore+ − × ÷Endless Practice Mode
Drill addition, subtraction, multiplication, and division across five difficulty presets with zero input lag.
ExploreToday / Week / All timeLive Global Leaderboards
Compare daily standings, weekly consistency, and all-time hall of fame ranks with transparent pace lines.
Explore12 badgesPrecision Analytics
Track accuracy, median solve times per operation, 30-day speed trends, and unlock 12 distinct achievements.
ExploreHow the Challenge Climbs
The daily challenge tests speed across five progressive difficulty bands:
- Warm upQ1–4Single-digit reflexes and speed calibration
- EasyQ5–8Two-digit mental combinations
- MediumQ9–12Multi-step arithmetic and carries
- HardQ13–16Large operand calculations
- ExpertQ17–20Advanced multi-digit mental speed