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- Fill in the grid with numbers from 1 to 6 (some numbers are given), and then partition the grid into 1 by 2 dominoes oriented in either direction so that all 21 possible dominos with numbers from 1 to 6, including doubles (1-1, 2-2, etc.), appear.
- Two adjacent numbers may be equal only if they are part of the same domino. In particular, there will only be six pairs of adjacent squares with equal numbers, corresponding to the six double dominoes.
- If one marks the greater number in each domino with a plus and the lesser number with a minus, no two plusses or minuses can be adjacent, as in the Magnets type. Double dominoes with two equal numbers are non-magnets and are not marked with a plus or a minus.