A minimalist physics puzzle game inspired by one of nature's most beautiful phenomena
Brownian is a puzzle game that transforms the scientific wonder of Brownian motion into a gaming experience. Players control a steel ball within a test tube environment, using elastic collisions to change the colors of floating particles. The objective is simple: match all particle colors before time runs out.
What sets Brownian apart from other puzzle games is its foundation in real physics. Every bounce, every collision, and every particle movement follows the principles of elastic collision physics and random molecular motion. This creates gameplay that feels natural and intuitive, yet presents increasingly complex challenges as you progress through the levels.
Brownian motion is named after botanist Robert Brown, who first observed the phenomenon in 1827 while studying pollen grains suspended in water under a microscope. He noticed that the tiny particles moved in seemingly random, jittery patterns that couldn't be explained by currents or evaporation.
The scientific explanation came later: these random movements are caused by countless invisible collisions between the visible particles and the much smaller, rapidly moving molecules of the surrounding fluid. Each collision imparts a tiny push, and the cumulative effect of billions of these collisions creates the characteristic random walk we observe.
In Brownian the game, we simulate this phenomenon at a visible scale. The colored particles exhibit gentle random motion, mimicking the behavior of real particles suspended in a fluid. Your steel ball acts like a larger particle, transferring energy through elastic collisions and changing the state (color) of particles it contacts.
Brownian was designed with several core principles in mind:
Brownian is a small weekend project I created purely for fun. I had a strong design idea—a game based on Brownian motion with a one-tap mechanic—and I wanted to bring it to life. During my PhD, I had to learn how brownian motion could influence complex socio-economic systems, and I was deeply fascinated by it.
Running the game involves some costs (App Store licenses and infrastructure), which is why we display a few ads. If you'd like to support the project, please consider enabling them.
If you want to reach me, feel free to write to brownian@gmx.ch or contact me directly on X at @fdecollibus. I'd love to hear whether you're enjoying the game and how we can improve it
Background Music (except "Brownian Main Theme") generated using Eleven Music by ElevenLabs, Pro Plan for Indie Games, 4th December 2025”
Ready to experience the physics of Brownian motion firsthand? Jump into the game and have fun!
Play Brownian Now