Missing number
Find the number that makes the sum true
Endless questions · One mistake ends the run · Starts at 10 seconds a question and tightens to 6
Leaderboard
How to play
Your streak is the score — how many you got right in a row before the run ended. Each board keeps the best run per name.
The sums get harder the longer your streak runs — from single digits up to carrying and two-digit tables. Pick one operation to drill it, or play them mixed. The wrong answers are the ones people really make, like the next row of the times table.