The number increases by 1 every second. If the number contains 3 or 6 or 9, you must press the button. If you don't press it, you won't get a score and you will just skip it. If more than one 3, 6, 9 is included, you must press that number. For example, if you have 33, you have to press it twice. Even if it is 36 or 39, you have to press it twice. The game ends at 60 seconds.
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