Take turns moving your plus/minus to a surrounding tile. The plus adds 1 to the number on that tile (adding 1 to a 9 turns it back to a 0), the minus substracts 1 (substracting 1 from a 0 turns it back to a 9).

You can’t move your plus/minus to a tile when another symbol is on it. Moving your symbol of the edge of the game board transports it to the opposite side.

The correct number turns a tile green, the wrong numbers are marked in red. You solved the challenge when all the numbers on the game board are the same as the number given in the challenge (see the numbers next to the game board).