One Line Puzzle
Connect every dot in a single unbroken stroke — never lift your finger. 505 handcrafted puzzles, a world to untangle, and a little companion who's rooting for you.
How to play
Press any dot to start your line.
Drag across all the connections — each exactly once.
Finish it all in one unbroken stroke to solve the puzzle.
Features
From a gentle triangle to fiendish lattices — every level is designed by hand.
Meet Lin and friends across an animated 12-chapter tale — plus seasonal surprises like the Hollow's Eve event. 🎃
No internet needed. Perfect for flights, commutes and waiting rooms.
Unlock calming color worlds as you earn stars.
A fresh puzzle every day and a streak worth protecting.
Perfect-solve streaks, fastest times, and 12 badges to chase.
Meet the cast
Hopeful, brave, and a little cheeky — Lin lights up the dark one stroke at a time.
Not a villain — just a lonely line that held on too tight. Can you help it let go?
Tiny, warm and endlessly encouraging. Pip cheers every line you draw.
Free on the App Store. One line is all it takes.
Download Monoline