How to play
Set each outlined domino to + −, − +, or neutral.
- Tap either half to cycle: undecided → + − → − + → neutral → undecided. The first half is the top or left half.
- Each row and column has a target for its plus poles and minus poles. Match both numbers.
- Equal poles cannot touch horizontally or vertically. Diagonal contact is allowed.
- Both halves of a neutral domino are empty. Mark every domino, including neutral ones, to finish.
- Outlined starting clues cannot change. A dot marks a neutral half; a question mark is undecided.
A new puzzle every day. Monday and Tuesday are smaller introductions; Friday and Saturday bring larger challenges. Every published board is checked for solvability. No clock. Progress saves on this device. Keyboard: Tab between squares, Enter or Space to play; arrow keys move within grids.
A new puzzle appears every day at midnight. Solve it daily to build your streak.