If you have five spare minutes, Pong Pro will fill them. Everything happens on one screen with first to 11 goals, paddle at 16% of screen height, and the whole thing runs straight in the browser - no downloads, no sign-ups, no fuss.
Ball speed climbs on every paddle hit, and the return angle depends on where the ball meets the paddle, so control is about position, not timing alone. Spin from a moving paddle bends the return, and that is where rallies get mean.
It suits anyone with a queue to wait in or a kettle to watch: students between classes, commuters, parents stealing ten quiet minutes. There is no meta-progression to lose and nothing to catch up on - a week away costs you nothing but a little sharpness.