Loopy Puzzle Online

Loopy is one of the classic one-player logic games in Simon Tatham's Portable Puzzle Collection. Draw a single closed loop, given clues about number of adjacent edges.

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Preparing the game board and controls.

Game Objective

Draw one single closed loop along the grid edges. A number inside a cell tells exactly how many of that cell's surrounding edges must be part of the loop.

Draw a single closed loop, given clues about number of adjacent edges.

How to Play

Click a grid edge to mark it as part of the loop, usually shown as a dark line.
Click it again to make it undecided.
Right-click an edge to mark it as definitely not part of the loop, usually shown as a faint grey line.
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 with easy clues. A 0 means none of the surrounding edges are used; a high clue means most surrounding edges are used.
At any corner point of the loop, exactly two dark loop edges should meet. One edge makes a dead end; three edges make a branch.
Do not close a small separate loop early. The final answer must be one connected loop covering all required clues.