One Line: Draw Brain Puzzle

One line. Every path. Never lift your finger. Pick a dot, follow the lines, and see if you can cover a whole shape in a single unbroken stroke. Every line has to be drawn exactly once — no more, no less. The rule takes a moment to learn. Getting good at it takes a while longer, and that's the part worth staying for. WHAT YOU'LL DO • Trace a shape from end to end without lifting your finger • Look before you draw — the dot you start from is half the answer • Back up a line and try another way whenever a path runs out • Meet a new twist now and then, and meet it again when it counts BUILT FOR THINKING, NOT RUSHING • No countdowns, no lives, no streak to lose in a hurry • Come back to a board you've already solved and do it cleaner • A puzzle is never a wall — there's a nudge waiting when you want one • Worlds open one after another, each a little heavier than the last QUIET BY DESIGN • Plays offline, wherever you happen to be • One hand, one finger, a minute at a time • No account, no sign-up, nothing to set up first • Soft night colors and quiet sound, both easy to turn off Free to play, supported by ads.