Place
Drag parts out of the tray. Some slide along a rail, some you can spin with the rotate handle.
Free - no sign-up - works offline
Build the contraption.
Build the contraption.
Let physics finish it.
Drag a ramp, a crate, a spring, a fan or a magnet into the lab. Press PLAY once and watch gravity carry the ball to the cup. Ten levels, each solvable in under a minute.
Loads instantly in your browser
10 levels
0 sign-ups
~40 s per round
How to play
Three steps, thirty seconds
Press PLAY
The ball drops. Gravity, friction, bounce and every gadget you placed take over - you cannot steer it.
Land it
Get the ball's centre into the cup. Missed? RETRY keeps your layout so you only adjust what was wrong.
Levels
Ten experiments
Each level introduces exactly one new idea, and every one is verified solvable by simulation before it ships.
Create
Build your own level
A full level editor is built in. Make a puzzle, prove it can be solved, and send it to anyone as a link.
Build
Drop in floors, slopes, walls, grip mats and moving shuttles. Place the ball and the cup, then choose which gadgets players get.
Prove it
Beat your own level in test play. Only a level you have solved can be shared - no impossible puzzles.
Share a link
Send it as a link, or publish it to the public gallery where anyone can play it, like it and chase the fastest time. Every level is proven solvable first.
Open the level editor
Or remix any official level and make it harder. Browse the player gallery →
Records
Your records
Your best times stay in this browser. World records come from the global leaderboard.
No runs yet. Play a level and your times appear here.
Global leaderboard: every submitted run is replayed on our server, so a time cannot be faked. Only your leaderboard name is shown.
Why it is worth a minute
No account, no cost
No sign-up, no email, no payment, no ads. Open the page and play.
Installs and runs offline
Add it to your home screen and it keeps working with no connection.
Phone and desktop
Built touch-first with pointer events, so a finger and a mouse behave identically.
Honest physics
A purpose-built solver at a fixed timestep. The same run gives the same result every time.
FAQ
Questions
Is it really free?
Yes. There is no account, no payment, no subscription and no advertising anywhere in the game.
Do I need to install anything?
No. It runs in any modern browser. You can optionally install it as an app from your browser menu, after which it also works offline.
Does it collect my data?
No account, no ads, no analytics. If you use the online gallery or leaderboards, the server keeps the levels you publish and your leaderboard name and times, linked to a random ID your browser creates - never your email, real name or IP address. Details are in the privacy policy.
Can I play on a phone?
Yes. It is designed for a vertical phone screen first, and works the same with a mouse on desktop.
Is there a leaderboard?
Yes. Every official level and every gallery level has a global leaderboard. Your winning run is replayed on the server, so times cannot be faked.
Can I make and share my own levels?
Yes. Open the level editor, build a puzzle, beat it once in test play, then share the link it gives you. The level lives entirely in that link - nothing is uploaded - and the player's device checks your solution before they start.
Share it
Send a friend a puzzle they can start in one tap.
Ready for the first experiment?
Level 001 takes about forty seconds.
Start playing