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Extremely simple. Extremely addictive. Train your mind with basic sums of a digit in a time limit. You will betray breves.You have three game modes:- Normal: you have 1.5 seconds to calculate operations .- Bonus time: in this way you have 2.5 seconds. The remaining time will accumulate to the next operation . No time limit, you are the limit.- 60: you have 60 seconds to calculate the maximum number of operations.Challenge your friend