Brainrot simulator: the formats, explained

'Brainrot simulator' covers a few different kinds of games. The most common are battle simulators, where you place brainrot armies and watch them fight, and collect-and-earn games like Steal a Brainrot on Roblox. Here is how each format plays, and where to try a brainrot battle sim on Roam.

The four simulator formats

Battle simulator. Place two armies, press start, let physics decide. Landfall made the format famous with Totally Accurate Battle Simulator, in early access from 2019 and fully released in April 2021.
Steal and earn. Buy brainrots, put them in your base, and they earn money every second while others try to steal them. Steal a Brainrot, a Roblox hit from May 2025, is the big one.
Catch and evolve. Trap brainrots in the wild, feed them and evolve them on your farm. Catch a Brainrot on Roblox, from the developer Indieun, launched in July 2025.
Merge and defend. Summon units, merge two into a stronger one and hold a road against waves. It is tower defense with brainrot faces.

Tips for brainrot battle sims

Put tough units in front and fast hitters behind. A wall that soaks hits while the damage dealers work beats one big blob almost every time.

Spend on a few strong units before many weak ones, then test. Battle sims are about trying again, so a lost fight is just data.

Change one thing between fights. If you swap the whole army, you never learn what made the difference.

Use the map. High ground, choke points and gaps matter in most battle sims, and silly units still fall off cliffs.

Brainrot simulators on Roam

Clash of Legions is the battle sim on Roam: place your army, then press fight. For merge-and-defend, Brainrot Defense has you summon, merge and hold the road.

Want a format that is not here, like a brainrot life sim or a brainrot farm? Describe it in a sentence and Roam builds it. Then change it by talking until it plays the way you pictured.

Play it on Roam

Make your own brainrot simulator with Roam

Pick the format and the characters. Roam builds a playable sim, and a friend can pick the other army. Roam is rated 13+ on the App Store.

Try: "brainrot battle simulator on a beach, place sneaker sharks vs bomber crocodiles, 1000 coin budget, press fight, my friend picks the other army"

Create it with Roam Pre-register on Android See Roam

Roam ("Roam - Make Games" on the App Store) is an iPhone app where you play games and make your own by describing them or from a photo. It is free to download and play, and making games works without a subscription; optional Spark and Reality plans and credit packs add more creation. Android: pre-register on Google Play.

Questions people ask

What is a brainrot simulator?

A game where you build, battle or collect Italian brainrot characters. Battle sims and steal-and-earn games are the most common kinds.

Is there a brainrot life simulator?

Fans search for one, but most brainrot games are battle, steal, catch or merge games. You can describe a life sim to Roam and play that instead.

Who made Totally Accurate Battle Simulator?

Landfall, a studio from Sweden. The game left early access in April 2021.