slither.io by Lowtech Studios runs on one rule: your worm grows as it eats, and any worm whose head touches another body dies. Small worms outmaneuver giants, giants wall off whole regions of the arena, and every run ends in a single mistake. We wanted that loop without ads, lag, or a server, so we built Neon Serpent. It runs right on this page against AI rivals, free, with nothing to install. Tap to start.
Play Neon Serpent now
Drag or move the mouse to steer, and hold to boost. Cutting off a bigger worm is the whole game.
How to play
Steer with your finger or mouse: your worm follows the pointer, and on touch a short drag in any direction sets your heading. Hold to boost. On desktop that means holding the mouse button or space; on a phone, keep a second finger down or double-tap and hold. Boosting is a trade: you move faster but burn length, and the burned length drips out behind you as pellets anyone can eat.
Grow by eating the glowing dots. When any worm dies, its whole body bursts into pellets, so a well-timed cut-off in front of a bigger rival is the fastest way to gain length. The scoreboard tracks the arena’s top five, all clearly labeled as bots, plus your rank. Each day has its own arena layout and bot roster, seeded from the date. Your best length is saved on your device. Nothing leaves your browser.
How it compares to slither.io
Neon Serpent keeps the loop that makes slither.io work: eat, grow, boost, and cut across a rival’s path so their head meets your body. Boosting burns length and leaks pellets behind you, dying turns your whole body into food, and the camera pulls back as you grow, so a big worm feels big. Runs last anywhere from twenty seconds to several minutes, and restart is one tap.
The honest difference is the other worms. slither.io fills its arena with hundreds of real people. Our arena holds ten to fourteen AI worms that hunt pellet clusters, dodge threats, and occasionally try to cut you off. They are decent company and they die like anyone else, but they are bots, labeled as bots, and everything runs on your device. We also skipped the cosmetic skins and the nickname screen.
That trade buys some real advantages. There is no server, so there is no lag: your worm turns the moment you do, which matters at boost speed. There are no ads between runs. And once the page loads, a connection drop changes nothing. If you want the nerve of threading between two humans who both want your pellets, get the real slither.io below. If you want the loop itself, clean and instant, it is right here.
Get the full game
slither.io is free on Android, and years after launch its servers are still busy around the clock. The mobile app adds an offline AI mode, cosmetic skins, and the full massively multiplayer arena that made it famous.
Frequently asked questions
Can I play slither.io in a browser?
Yes. Unlike most mobile hits, slither.io started as a browser game, and the official version still runs at slither.io against real players. Our game answers a different need: Neon Serpent plays offline against AI rivals, with no ads and no server lag, and it lives right on this page.
Is this the real slither.io?
No. Neon Serpent is an original game we built around the same eat, grow, and cut-off loop. It is not affiliated with, endorsed by, or connected to Lowtech Studios in any way. All art and sound in our version are original work, and the download links above point to the official app.
Is it multiplayer?
No. Every rival in our arena is an AI worm running on your device, and each one is labeled as a bot in the arena and on the scoreboard. There are no fake humans and no connection to other players. For real multiplayer, use the official slither.io app or website.
Is it free?
Completely. There are no ads, no in-app purchases, no accounts, and no data collection. Your best length is stored in your browser’s local storage and never sent anywhere.
Does it work offline?
Once the page has loaded, our game makes no further network requests, so it keeps running through connection drops. The official slither.io website needs a connection to its servers, since every worm you meet there is a real person. The mobile app also includes an offline mode against AI.
