Knife Ninja

Open Knife Ninja and you are playing — an Arcade game that runs on the page rather than beside it. It is built for touch, so a phone or a tablet is the natural place for it. Listed under adventure, arcade, casual, collecting, hypercasual.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. Everything runs client-side, so there is nothing to set up before you start.