Attack on Titans

Open Attack on Titans and you are playing — a Hypercasual game that runs on the page rather than beside it. Taps and swipes are the whole vocabulary — a phone plays it best. Listed under arcade, best, hot, html5, hypercasual.

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.