Phun Algodoo |top| Direct

So go draw a ramp. Place a circle at the top. Press space. And remember: physics isn’t a subject. It’s a verb. Have you used Phun or Algodoo? What’s the most ridiculous or brilliant thing you’ve built? Let me know in the comments—or better yet, share your scene file.

He called it . The name was perfect. It was phun. phun algodoo

If you were a curious kid with a computer between 2008 and 2012, chances are you stumbled upon a bright, sandbox-style program where you could draw a circle, click "play," and watch it roll down a ramp you just sketched with your mouse. So go draw a ramp

Let’s dig into the history, the magic, and why you should download it right now. The story begins at Umeå University in Sweden. A master’s student named Emil Ernerfeldt wanted to create a real-time 2D physics sandbox that felt like drawing on a whiteboard—only everything you drew obeyed gravity, friction, restitution, and density. And remember: physics isn’t a subject

The community exploded. Suddenly, teenagers were building working gear trains, marble machines, catapults, and hydraulic lifts—all in a free, lightweight program. In 2008, the team behind Phun founded and released a polished, professional version named Algodoo (a playful mix of "Algoryx" and "Phun").

Want a ramp? Scribble a line. Want a box? Draw a rectangle. Want water? Grab the fluid brush. Everything you create instantly has mass, collision, and reaction to forces.

Phun was a gift. Algodoo is that gift, polished and expanded. Whether you’re a teacher tired of static diagrams, a parent looking for screen time with substance, or just someone who wants to build a giant domino topple for no reason—