Self feed in agar.io: how it works and where to play

What self feeding is

Self feeding is ejecting mass into your own cells instead of at viruses or other players. Split into two pieces, park the big piece behind the small one, and hold the feed key: the front cell swallows every pellet the back cell throws, and mass flows from one piece of you to the other.

Players use it to move mass where it is needed: pumping a freshly split cell back to fighting size, transferring weight to the cell that is about to corner someone, or rebalancing after a messy multi-split. On classic servers that is all it is, a transfer tool.

Why it always costs you mass on classic servers

On standard agar rules every eject is a losing trade: your cell loses more mass than the thrown pellet carries, and the receiving cell only gains what the pellet carries. Feed yourself long enough and you shrink. That asymmetry is deliberate, because it is what keeps "throw mass at yourself" from being an infinite growth loop.

So on classic servers self feeding is positional, not economic. You do it to move mass, never to make it.

The macro half: feeding fast enough to matter

Transferring any real amount of mass takes dozens of ejects, which is why self feeding in practice means a feed macro: holding one key to eject continuously instead of hammering it. On agar.io that historically meant browser extensions.

On alis.io the macro is built in: hold W to keep ejecting, with instant, buffered inputs, no extension required. The other built-in tools live on the mods page.

The Self Feed mode: where the economics flip

alis.io runs a dedicated Self Feed server that inverts the classic trade: each eject carries 64 mass and costs your cell only about 42, so feeding yourself GAINS roughly a third of every throw. Merge time is zero, mass never decays, and cells grow to a cap in the millions.

That one flipped number changes the whole game. Growth is no longer about hunting pellets or players; it is a race to cycle mass through your own cells faster than everyone else, splitting to widen the pipe and instantly merging back. The fastest self-feeders win, and fights are decided by who can keep feeding while dodging.

It runs around the clock, free, in the browser: play Self Feed. It is one of several free-for-all variants on the site; the full list is in the game modes guide.