((top)) — Phun Algodoo

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—

Today, Algodoo is used in classrooms from middle school to university. But it has never lost its original, joyful weirdness. Here’s what makes Algodoo different from every other physics simulator (including expensive ones like MATLAB/Simulink or even PhET): phun algodoo

He called it . The name was perfect. It was phun. Phun was a gift

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"). But it has never lost its original, joyful weirdness

That program was . Today, it lives on as 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.

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.