Loops. One line, closed.
Each number counts how many of its own four sides the line uses. Draw sides until a single loop closes, with no branches and no crossings. Take your time.
Enable JavaScript to try the puzzle.
How to play and save
Draw a side between two dots. A number counts only the sides of its own cell, so a 0 means the line never touches that cell and a 3 means it uses three of its four sides. A cell with no number is free.
The finished line is one closed loop: every dot it reaches has exactly two sides, and there is no second, separate loop anywhere.
Cross out a side you believe the line never uses. It is a note to yourself and costs nothing. Drawing or crossing the same side again takes the mark back.
Arrow keys move between cells, and Shift with an arrow marks the side in that direction. D and X choose whether you are drawing or crossing out. Tab reaches all controls.
A finished loop earns 100 points. Lines drawn counts the sides you drew, including ones you later took back out. Your best active time is compared only on the same board. There is no countdown.
This Playroom is running without accounts, so there is no sign-in here. Your games and results are kept in this browser, on this device.