Choose a Contraption

🏆 Leaderboard

Every score is replay-verified: the server re-runs your machine and scores it on parts used and how quickly the contraption completes.

Pick an inventor name

Shown on the leaderboard. No account, no email — just a nickname. 2–14 letters.

🎯 Challenges

Play a friend's machine, or build one of your own. Every published challenge is verified solvable.

👤 Inventor Profile

You are ? — change name

Your secret inventor code

Keep it safe like a password! Enter it on another device to carry on with your name and leaderboard scores.

Continue from another device

Paste the code from your other device. It replaces this browser's inventor.

IT WORKS!

Machine Complete!

⚙️⚙️🔩

The Reub Goldberg

Reuben's Marvelous Machines

Build wonderfully silly contraptions — ramps, trampolines, fans, balloons, seesaws and more — to solve each puzzle. Inspired by the classic The Incredible Machine.

Played before on another device? Continue with your inventor code