Singles Puzzle Online
Singles is one of the classic one-player logic games in Simon Tatham's Portable Puzzle Collection. Black out the right set of duplicate numbers.
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Game Objective
Black out some numbered squares so each row and each column has no repeated visible number. The squares you leave white must still form one connected area, and two black squares may not touch up, down, left, or right.
Black out the right set of duplicate numbers.
How to Play
Left-click a square to black it out; click it again to make it white again. Right-click a square to circle it when you are sure it must stay white.
These puzzles reward careful deduction more than speed. Start with the most constrained clues, eliminate impossible choices step by step, and avoid guessing unless the puzzle specifically calls for it.
Beginner Tips
- Start by looking for the same number repeated in one row or one column; at least one of those copies must be black.
- If you mark a square black, the squares directly above, below, left, and right must stay white.
- Do not split the remaining white squares into separate islands; diagonal touching does not connect them.
Official Rules
For the full original rules, examples, and advanced options, read Simon Tatham's official manual.
Read the official manualFrequently Asked Questions
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