If you have five spare minutes, Pong Mirror will fill them. Everything happens on one screen with first to 7 goals, paddle at 24% 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.
Nothing here needs a tutorial or a wiki. Controls are one gesture, the goal is one sentence, and the difficulty comes from execution rather than homework. That is exactly what a browser game should be.
First to 7 goals wins. Play a friend or the CPU.
Pong Mirror announces itself inside ten seconds, which is the only test that matters when sorting a catalogue this size. Gaduh Shelf games are chosen for how quickly they say what they are.
Difficulty sits at Medium and the player count at 2. Those two numbers decide more about whether you will enjoy it than the theme does.
If you are choosing between this and something similar, start here when you have Medium energy and elsewhere when you do not. Pong Mirror does not pretend to be more than it is.