UpNumber is a brain testing game that will reveal how quick your brain responses to the given task. Mainly, you are given a 4-digit number, for example 1234. Your task is to increase every digit of that number by 1. Therefore, if the number is 1234, you should type 2345. The goal of the game is to solve as many numbers as possible within 60 seconds.
You can compete with other players and submit a high score (if you manage to achieve that!).
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