Magnet Dominoes
Magnet Dominoes starts with a board already split into gray two-square tiles. Some tiles are magnetic, carrying a positive pole on one half and a negative pole on the other. The others are blank. Numbers around the edge tell you how many plus and minus poles each row and column holds.
From those counts you figure out every tile and every direction. Each puzzle is built to be solved by reasoning alone. Nothing needs installing, and it works on desktop or touch screens.
How to play Magnet Dominoes
A magnet tile puts a plus on one square and a minus on the other. A blank tile has two neutral squares. Clues on the top and left beside the plus sign count plus poles in that column or row. Clues on the bottom and right count minus poles.
One more rule ties things together: identical poles may not sit next to each other up, down, left or right. Neutral squares can touch anything.
Clicking a tile drops in a magnet whose positive half lands where you clicked. A second click reverses its poles and a third removes it. Use the right button instead to call a tile blank. The board flashes when everything is right. Preset boards come in three sizes, the largest being 10x9, each with an Easy and a Tricky setting.
Controls
| Action | Keyboard | Mouse | Touch |
|---|---|---|---|
| Place, flip, then clear a magnet | Arrow keys, then Enter (repeat to cycle) | Left-click a tile (repeat to cycle) | Tap a tile with Tap set to Magnet |
| Mark blank, then not blank, then clear | Space (repeat to cycle) | Right-click a tile (repeat to cycle) | Hold a tile, or set Tap to Blank domino |
| Fade a finished clue | — | Click the clue | Tap the clue |
| New game, undo, redo | N, U, R | Menu bar buttons | Menu bar buttons |
Tips
- Add a row's plus and minus clues. If the sum equals the row length, no square in that row is neutral.
- A plus count of 0 means every square in that line is minus or neutral, which often settles tiles crossing it.
- Each magnet you place limits its neighbors, since the squares touching its plus cannot be plus and those touching its minus cannot be minus. Follow that chain outward.
- A sideways tile sitting wholly inside a row puts a positive and a negative pole into that row together. When a row's two clues differ, the difference has to come from upright tiles.
- Use the not-blank mark for tiles you know are magnets but cannot orient yet.
If you like Magnet Dominoes, try these
Dominosa Domino LogicDominoes on a number grid return here, with the job of splitting the board so every pair of values shows up once.
Unruly Black and WhiteBalancing two opposites across rows and columns drives this one as well, coloring squares black or white with no three in a line.
Questions
What do the numbers in Magnet Dominoes mean?
Numbers next to the plus sign count plus poles in that row or column, and numbers next to the minus sign count minus poles. Blank squares are not counted by either.
Does Magnet Dominoes need guessing?
No. Every generated board has a solution you can reach through logic. Tricky boards just need longer chains of reasoning than Easy.
How do I mark a blank tile on a phone?
Press and hold the tile, or switch the Tap control above the grid to Blank domino and tap normally. Switch it back to Magnet to place poles again.
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