Adder - The Rules
This game helps you improve your math additions skills! The purpose of the game is to clear the board. If the board becomes full, the game is lost. At each step, the current digit is placed on the board in a free spot indicated by you. If the sum of the digits in the neighboring squares adds up (modulo 10) to the current digit, then the digit and its neighbors are cleared from the board. Good luck.
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