Test your blink/short term memory! A number will be flashed for 1 to 5 seconds depending on the length of the number. Remember the number. Then input the number that was flashed. Difficulty levels from 4 to 20 digits. Good luck! Split number into 1 to 4 groups Achievement table to keep track of your progress Email your suggestions and comments to firstname.lastname@example.org Tags: puzzle, brain, memory, digit span, number span
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