draw lines.io

draw lines.io is one of the Puzzle games here that asks for no download and no sign-up. Taps and swipes are the whole vocabulary — a phone plays it best. Listed under .io games, android, educational, html5, ipad.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. Free to play in the browser, with no install step between you and the first round.