Game Rules: This game consists of 20 levels, and each level lasts for 5 seconds. It starts with 1 - digit numbers and goes up to 20 - digit numbers. At each level, a corresponding - digit number will appear, and you need to memorize it within the 5 - second countdown. After the countdown ends, an input box will appear. You should enter the number and click the "Submit" button. There are 20 grids at the top of the game, each representing a level. A correct answer will turn the grid green, while an incorrect one will turn it red. After all 20 levels are completed, your total score will be displayed. The first level is worth 5 points, the second level is worth 10 points, and the 20th level is worth 100 points, and so on. The total score is 1050 points. If you score 840 points or more, it's considered excellent. The higher the score, the better.