Tricky Cups‏

Browser Puzzle: Tricky Cups‏ needs a tab and nothing else. Taps and swipes are the whole vocabulary — a phone plays it best. Listed under .io, 1 player, 2d, 3d, adventure.

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.