Forecast
An infinite, one-input game about a forecast: a mark says where the next push will land, and it is right four times in five.

The mark is the forecast. Tap to brace for it. Tap to stop a push.
A dot sits in a ring, and pushes come that would throw it out. A second before each one, a mark shows where it will land. Tap while the mark is up and you are braced, and a right brace absorbs the push. A tap during a push stops it where it has got to.
The forecast is right four times in five. A brace on a wrong one throws the dot the other way, and nothing about that mark looks any different.
Nothing gets harder. The forecast is as good at the last push as at the first, and you can always still watch.
The card says how often the forecast was right, and how often you trusted it.
Canvas2D, so the game is whole on any phone. No camera, no account, and nothing leaves the machine.