Loopy
Draw one closed loop that meets every clue’s count
- Lines
- –
- Clues met
- –
Click or tap an edge to draw a line; right-click or Ctrl-click to cross it out; Shift-click clears it. A tap cycles line, cross, clear. With the keyboard, arrows move between cells and [ or ] picks an edge of the cell; Enter or Space draws, X crosses and Backspace clears. Ctrl or ⌘ Z undoes; Shift Z redoes.
Progress saves on this device.
How to play
Draw a single closed loop along the lines of the grid. The loop never crosses or touches itself, and it need not visit every dot.
A number in a cell says how many of that cell’s sides the loop uses. Cells without a number can have any count. Cross out an edge you know the loop avoids.
Three or more lines at a dot, a dead end, a second loop and a clue with too many lines (or, once the loop is closed, too few) turn red with a dashed pattern. Undo and Redo follow your history; a new move after Undo replaces the old branch. Restart clears the board and can be undone. Solve reveals the answer; a puzzle finished with Solve does not count as solved.
Engine: Simon Tatham’s Loopy, from the Portable Puzzle Collection. MIT license and credits.