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Start Domino Sudoku multiplayer and take on other Sudoku players.
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Academy is a good starting point if you have never played Domino Sudoku before.
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Avoid solving marked pairs as if they were ordinary adjacent cells. The domino relationship should be checked throughout the solve.
It can be harder because marked adjacent pairs add another layer of logic, but those markings can also give helpful extra information.
Variants based on regions, neighbours or local relationships are natural next steps if you enjoy Domino Sudoku.
That depends on the puzzle rules. Some domino variants define only marked pairs, while others also give meaning to unmarked adjacencies.
No. The normal Sudoku rules still apply. Domino markings add local relationships on top of the standard grid.