Reverse your probe's orbit and weave through rotating arc shutters
A lime-green probe is locked onto a fixed ring around a gas giant, and it will keep travelling that ring for as long as you let it. Tap anywhere on the screen and it reverses direction instantly. That single tap is the whole of your control, and learning to place it well is the whole of the game.
The ring is crossed by rotating arc shutters. They sweep around the orbit at their own pace, opening gaps and closing them again, and your probe has to be on the right side of the ring at the right moment. Sometimes that means reversing early and doubling back the way you came. Sometimes it means holding your nerve, letting the probe run on, and timing the turn to the last possible instant as a shutter swings clear.
Scattered along the ring are sparks. Collect every one of them and the level is complete. That sounds simple until you realise the sparks are deliberately placed on the far side of the shutters, so clearing a lap is never a matter of circling in one direction and sweeping them all up. You have to plan a route: which sparks to take on the way round, which to leave for a reversed pass, and where to wait while the arcs rotate into a shape you can slip through.
Touch a shutter and the probe loses one of its three lives, and the lap restarts. Three mistakes and the level begins again from the start. It makes every reversal count, and it turns each attempt into a quiet exercise in reading the rhythm of the arcs rather than reacting to them.
There are fourteen levels, and each one rearranges the geometry: different arc speeds, different gaps, sparks tucked into places that look unreachable until the rotation lines up. The early rings teach you the feel of the reverse tap. The later ones ask you to hold two or three moving shutters in your head at once and commit to a turn before you can see whether it will work.
The look is deliberately spare — a bright probe, a thin orbital ring, the grey-banded curve of the gas giant filling the background — so nothing competes with the movement you are actually watching. Pick it up for one lap or settle in and work through the whole set of rings at your own pace.