Twenty
Sums
Twenty questions against the clock. Pick a level and the operations, then go.
Keys 1–5 set the level · + − * / toggle operations · Enter starts
Level 1
01 / 20
0:00.0
Type digits · Enter answers · Backspace fixes
Finished in
0:00.0
New best clean run
Level
Operations
Per question
Accuracy
Best clean
Time per question
11020
CorrectMissed
Missed