Untangle

The ad said you could untangle it. This one actually lets you.

Untangle is the puzzle those mobile ads keep promising and almost never ship. Drag the dots until none of the ropes cross. That is the whole game.

• Every level is guaranteed solvable. Boards are generated as planar graphs and then scrambled, so you can never be handed an impossible layout.
• No timers, no lives, no "watch an ad to continue." Free, no account, nothing to install.
• Endless. Levels grow from 5 dots up to 14, with crossing chords appearing from level 3.
• Mouse or thumb. Built for a phone screen first, plays fine on a desktop.

Red ropes are the ones still crossing something. Green means clear. When the counter at the top reads no crossings, the level is done.

Also playable at untangle-liard.vercel.app.