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Make an .io game

.io games are simple arena games where you grow by eating, claiming or knocking out everyone else, with a leaderboard of the biggest players. They're named after the web addresses the first ones used. Modder's AI .io game maker builds the arena, the growth rules and a crowd of bots, so the game is busy from the first second, and can open rooms for friends.

Updated Tested by the Modder team

.io games on Modder

A snake, a cell and a trail of paint. Each one fills its arena with bots that play to win.

Neon NoodlesModder Originals5Blob GobbleModder Originals3Turf GrabModder Originals1Bumper BrawlModder Originals5Spin PilotsModder Originals3
On this page
  1. Building an .io game
  2. The .io ideas that work best
  3. Good at, and limits
  4. Questions

By the numbers

A new game on Quick build
~7 min
A new game on Long build
~25 min
Games it builds, played in the browser
2D and 3D
Where the games play, no download
Phone and desktop
Players in one online room, bots in empty seats
Up to 10
Per game, up to 2 MB each
2,000 files

Build times are the builder's own estimates for a new game; the rest is from Modder's limits on .

Building an .io game

  1. Name the way you grow

    Every .io game is one rule about growing: eat pellets, swallow objects, claim ground, absorb smaller players. Say yours, then say how you lose (crash into a body, get eaten, have your trail cut) and how long a round lasts.

  2. It fills the arena

    The builder makes a big arena, the growth rule, a live leaderboard and bots that hunt, flee and grab. Bots are what make .io games work when there's nobody else online, so it gives them simple personalities: some greedy, some cautious. Then it plays a round to see that growth, deaths and the leaderboard all work.

  3. Invite friends, or don't

    Pick Online with friends under the prompt box and the game gets rooms: share the invite link and up to 10 people play in one arena, with bots in the rest of the seats. Or keep it single player against bots. Either way, tune it by playing: arena size, bot count, boost cost.

The .io ideas that work best

The classics all have one clear rule and a reason to take risks. Snake games reward cutting people off. Cell games make you choose between splitting to attack and staying big to survive. Territory games tempt you to draw bigger loops and leave your trail exposed. Hole games are pure greed: swallow more, faster. Pick the risk, and the rest of the game follows from it.

Short rounds help. A two- or three-minute round with a winner at the end feels better than an endless arena, and it's easier for friends joining a room.

What it does well, and what it doesn't

Good at

  • Arenas with dozens of bots at a steady frame rate.
  • Live leaderboards, growth rules, boosts and power-ups.
  • Online rooms for up to 10 friends by invite link, bots filling the rest.

Current limits

  • No public servers with hundreds of strangers; rooms are by invite and hold up to 10 people.
  • No skin shops or real-money items inside the games.
  • Best with a mouse; touch works as a fallback.

Questions

Can strangers join my .io game?

Not through public matchmaking. Anyone with your room's invite link can join, up to 10 players, and bots fill the arena around them.

Can I make a snake .io game?

Yes. Neon Noodles on this page is one. Describe the snake, the boost and how you die, and the builder sets up the arena and the bots.

Do .io games work single player?

Yes. With bots, every .io game is playable alone. Online rooms are an option you pick under the prompt box.

How many bots can an arena have?

Dozens. The games here run 12 to 30 bots comfortably; say how many you want in your prompt.

Making games on Modder

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Playing every game is free. Making games needs a plan or a one-off credit top-up.

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