The score depends on how fast you can get from 1 to x. A stopwatch is started when you tap 1 and stopped when you tap the last number.

If you improve in each level and remain a constant rate, you get more points in higher levels. Suppose you take 1 second to finish each level, your points in all levels will be: 320, 500, 720, 980, 1280, 1620.

See https://github.com/awendt/memory-chimp/blob/master/game.js#L...