Osmos

You control a mote in an abstract world of drifting particles. Grow by absorbing smaller motes, while avoiding those large enough to absorb you.

Movement has a cost: ejecting mass propels your mote but makes it smaller. Levels ask you to balance that tradeoff while dealing with changing conditions, including intelligent motes, attractors, and repulsors.

Progress through 47 levels and bonus content, from quieter stages to more challenging worlds with gravity and orbital motion. Time controls let you slow events to maneuver or speed them up, and you can play randomized versions of levels.

Players often enjoy the atmospheric electronic music and the strategic physics-based play, describing it as a calm, absorbing experience that can also provide a challenge. Some find the later or gravity-focused levels slow or frustrating, and a few criticize the movement controls as finicky.