Eat cells, avoid bigger players, dominate!
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The game that invented the genre is still one of its best entries. If you want to understand why .io games exploded, start here — the split-and-eat loop is elegantly designed.
Pressing Space divides your current mass into two equal halves. The second half shoots forward at speed, letting you cover distance to eat a smaller cell. After roughly 30 seconds the two halves merge back into one. You can split up to four times if you have enough mass.
Those are viruses. If a cell larger than the virus touches it, the cell explodes into 16 smaller pieces — making it vulnerable. Small cells can hide inside a virus safely. You can also shoot a virus using W eight times to push it across the map toward enemies.
Miniclip acquired Agar.io and continues to run the servers. New seasonal skins and limited-time game modes appear periodically, though the core gameplay is unchanged from the original 2015 version.