1. 20 challenging levels with 5 seconds per level
2. Numbers increase from 1 to 20 digits
3. Memorize the number within 5 seconds
4. Input your answer when the timer ends
5. Green indicates correct, red indicates wrong
6. Points increase per level: Level 1 = 5pts, Level 2 = 10pts, etc.
7. Perfect score: 1050pts. Excellence: 840+ pts