About Squirm.io: what it is and how the worm game works
Squirm.io is a free multiplayer worm game played in a web browser. You steer a worm around a shared arena, eat pellets to grow longer, and make rival worms crash into you. No download, no install, no sign-up — the game starts the moment you press play.
How Squirm.io works
Every worm in the arena is controlled by a head. Steer with the mouse, turn with the left and right arrow keys, or drag anywhere on the screen with your thumb on mobile. Eating a pellet adds length; length is your score and the only thing the leaderboard measures.
The single rule that matters is this: if your head touches another worm's body, you die. Bodies pass through each other harmlessly, and you can coil through your own body as much as you like. That makes this a game about cutting people off, not about ramming them. Two heads meeting kills both worms, whatever size they are — there is no size tiebreak, so charging at someone bigger than you is never a winning move.
Boost by holding the left mouse button or Space. You move faster, but you burn length and it falls behind you as pellets that anyone can eat. Boosting away from a fight feeds whoever is chasing you.
Why this worm game is different
Most worm and snake io games punish size twice: big worms move slower and turn slower, so the arena stalls into a few enormous worms nobody can catch. In Squirm.io speed is constant. A worm of length 10 and a worm of length 10,000 travel at exactly the same rate. The only thing size costs you is turning circle, which is what keeps giants killable and small worms genuinely dangerous.
The arena never shrinks and never resets. It is one room that runs around the clock, and a run ends when you die and at no other moment — there is no timer, no round and no size limit waiting for you at the top.
When a worm dies it gives back 65% of its length as pellets and the rest is destroyed. That deliberate leak is what stops a long-running arena inflating until every worm is the size of the map.
There are no power-ups, no pay-to-win purchases and no gates on the first few minutes. Worm skins are cosmetic and always will be.
Play Squirm.io on mobile or desktop
On desktop, your worm follows the mouse and boost is the left button or Space. On a phone or tablet you drag anywhere on the arena — your worm goes where your finger is, exactly as it goes where the cursor is — and boost is the button in the corner. Turn the phone sideways and the arena turns with it. It is the same arena either way: this is one browser game, not a desktop version and a cut-down mobile one.
Because it is a browser game with nothing to install, Squirm.io also works on locked- down school and work machines where downloads are blocked. There is more on that on the Squirm.io unblocked page.
Common questions about this worm game
What is Squirm.io?
Squirm.io is a free multiplayer worm game played in a web browser. You steer a worm around a shared arena, eat pellets to grow longer, and try to make every other worm crash into you before you crash into one of them. There is no download, no install and no sign-up.
How do you play Squirm.io?
Move your mouse and your worm follows the cursor, or turn with the left and right arrow keys or A and D. Eat the glowing pellets to grow longer. If your head touches another worm's body you die, so the aim is to cut in front of other worms and make them hit you instead. Hold the left mouse button, Space or Shift to boost, which costs length.
Can you play Squirm.io with friends?
Yes — everyone in a region joins the same arenas, so you can play alongside friends by loading the game at the same time. There are no private rooms or invite links yet.
Is Squirm.io free?
Yes. Squirm.io is free to play in your browser with no download, no install and no sign-up. Every worm skin is cosmetic and none of them affect how the game plays.
Is there always someone to play against?
Yes. The arena runs around the clock and there is never an empty room — open the page and you are in a live game with other worms in a couple of seconds.
How do you boost in Squirm.io?
Hold the left mouse button, Space, Shift, or the up arrow or W on desktop, or the boost button on touch. Boosting speeds you from 200 to 380 units a second and burns 4 length a second, which drops behind you as pellets anyone can eat.
How do you become the biggest worm in Squirm.io?
Farm the pellet clouds left by dead worms rather than chasing loose pellets, cut in front of bigger worms instead of chasing them from behind, and only boost when you have somewhere to go. Length is the only score.
Can you play Squirm.io without downloading anything?
Yes. Squirm.io runs entirely in the browser on desktop, tablet and phone. There is nothing to download and nothing to install.
Play Squirm.io free Opens straight into the arena.