Fill the Gap

Rules

1. A 3-second countdown, then the GO signal.
2. A sum with a gap appears, like «7 + ? = 15», with numbers up to 50.
3. Find the missing number among the three options.
4. You answer with the 1, 2 and 3 keys or by clicking the answer.
5. You get 1 min from the signal.

How scoring works

Every right answer scores, more the faster you answer, and every wrong one costs you.

Levels

• Gold level2,500 points
• Silver level1,600 points
• Bronze level800 points

Levels are earned by result; medals are only for the CCI Olympics.

Tips

• Flip it round: «7 + ? = 15» is the same as «15 − 7».
• When in doubt, rule out: the last digit is often enough to tell which one it is not.

Event ranking

See the full ranking