Agar.io

Agar.io is a massively multiplayer cell-eating game where you start as a tiny circle and grow by absorbing smaller dots and players. You navigate a grid-like arena, splitting your mass to chase prey or ejecting bits to escape predators. Larger cells move slower, creating a constant risk-reward tension—do you stay nimble or grow huge? Death means starting over from scratch. Matches are free-for-all chaos with dozens of players simultaneously hunting and fleeing. The mechanics are simple enough to grasp in seconds, but reading the field and timing your splits separates survivors from snacks. Sessions last as long as you can stay alive, from thirty seconds to extended runs if you play it smart.