An effective educational game that develops mental arithmetic speed. The player is presented with a field filled with numbers. Below the field is a queue of digits. By clicking on the cells of the field, the player can increase the digit by the current value from the queue. If the sum of the digits is equal to 10, the digit disappears from the field, and the digits on the surrounding fields increase by 1. If the sum of the digits exceeds 10, the player loses one life out of five, and the digits on the surrounding fields decrease by 1. The players task is to clear the field in the shortest amount of time and with the fewest number of moves.
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