Single Loop
Connect dots into a single closed loop. Each number counts how many sides of its cell the loop uses.
Tab to the board and move between dots with the arrow keys. Space switches the line pen on, X the X pen; then arrows mark sides. Press the same key again to put the pen down.
How to play
Join the dots to make one single closed loop. A number tells how many of that cell's four sides the loop uses. The loop never branches or crosses itself. Tap a side to cycle line, X (not used), then empty. Drag along sides to draw several at once.
Learn more
Wherever the loop passes a dot, exactly two lines meet. So many sides are forced from numbers and dots together: a dot with two lines is finished, a dot with a dead end must continue. A side that would close the loop too early is not allowed while other lines or numbers remain.