Flash Sum

Rules

1. A 3-second countdown, then the GO signal.
2. There are 10 rounds.
3. In each one, 4 to 8 numbers (up to 20) flash up one at a time, each for 0.8 s at first and 0.4 s at the end.
4. Add them in your head and pick the total from three options.
5. You answer with the 1, 2 and 3 keys or by clicking the answer.
6. The event lasts 2 min at most.

How scoring works

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

Levels

• Gold level850 points
• Silver level650 points
• Bronze level400 points

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

Tips

• Keep a running total and forget each number as soon as you add it.
• When in doubt, rule out: the last digit is often enough to tell which one it is not.

Event ranking

See the full ranking