💨 Bottoms Up!
A free co-op physics racing game for your browser. Up to four friends, one round raft, and only farts for power.
▶ Play now, free
What is Bottoms Up!?
Bottoms Up! is a silly online party game. You and up to three friends sit on the rim of an inflatable raft and race it through canals, spikes and rapids, steering with nothing but farts. There's nothing to download and no account to make: type a name, share a 4-digit room code, and you're on the water.
How to play
Everyone faces the centre of the raft, so a fart pushes the raft from where you sit straight through its middle. To go forward, the people at the back fart. To steer, walk around the rim, or turn away from the centre to spin the raft. Push against each other and nothing happens: the skill is farting together at the right moment.
The rim is split evenly between whoever's playing: alone you get all 360°, two players get half each, three get 120° each, and four get a quarter. Gas runs out if you hold too long, so save some for the corners.
| Action | Keyboard | Phone |
|---|---|---|
| Fart | Space | FART button |
| Walk around the rim | ← → or A D | Joystick |
| Turn away from the centre | Q E | |
| Back to the last checkpoint | R | |
| Mute | M | Speaker button |
Levels
Pick any level you like, alone or with friends.
1. The Bendy Canal
A walled canal with a tight gap, a sharp turn onto spikes and a current that drags you sideways.
2. The Plank Road
No walls. Thin water roads high above a valley, with a crosswind and a sweeping gate. Drift off the edge and you fall.
3. Rapids Run
The long one: a spiked barrier, raging corners that are far easier with two people pushing, and a long unprotected road over the drop.
4. Windmill Ridge
No walls, and three giant windmills with spikes hanging down to the water. Ride round in the gap between the arms.
5. The Holey Road
Big holes in the middle of the track that pull you in as you get close. Then a crosswind joins in.
6. The Inferno
Everything at once on a long river spiralling into the middle: spinning spike circles you time your way through, holes that pull you in, and windmills.
Scoring and leaderboards
Only time counts; splats don't. Points are 1000 × par time ÷ your time × the number of players, so finishing in par time scores 1000 alone and 4000 with a full crew. There's a separate leaderboard for solo runs and for 2, 3 and 4-player crews.
FAQ
Is it free?
Yes. It's free to play in your browser, with no download and no account.
How many people can play?
One to four. Play single player on your own, or create a room and share the code with up to three friends.
Does it work on phones?
Yes. On a touchscreen you get a joystick to walk and a big FART button.
Are the farts real recordings?
No. Every fart is generated in code, and each player has their own voice: Classic, Squeaker, Rumbler and Wet One.
Who made it?
Bottoms Up! was created by Naman Khurpia, who builds AI by day and teaches physics engines to fart by night, with help from Claude. The source code is on GitHub.
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