This is an application that exercises hand speed and thinking ability.
Introduction:
1. Select the three most likely letters from the specified English alphabet, and selecting the correct letter indicates successful challenge.
2. Each level is interconnected and has patterns, which can be observed and challenged to form certain patterns.
3. The difficulty of each level increases or decreases correspondingly based on the duration of the challenge.
The rules of the level questions are generated based on common mathematical arrangements, cognitive knowledge, etc.
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