RiverRally.

Your boat moves forward on its own. Hold Left or Right, or use A and D to steer. Hold Down, S or B to brake. On a touch screen, drag sideways on the water to steer, or hold the buttons below. Release to straighten up.

Pass between the coral circle and blue square buoys. Steer early: the boat takes a moment to turn, and it keeps a little drift. Braking helps you make a tighter turn.

Clear eight gates, then cross the chequered line. A missed gate adds three seconds; a bump adds one. Keep going and try the next gate. P pauses. F opens full screen.

Gentle has wider gates and a slower boat. Classic has narrower gates and more speed. Compare times by racing the same river at the same difficulty. A new river is a fresh challenge, not the same leaderboard.

Best times stay on this device, for up to twenty river-and-difficulty combinations. No sign-up or public scores.