Chain Reaction — One-Click Particle Puzzle
Choose one moment and one position, then watch a single explosion spread through a field of moving particles.
Open gameInteractive experiments
Play,
combine,
discover.
Physics, artificial life, and music simulations to explore right in your browser. No downloads, no sign-ups.
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9 experiences
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All games
Every game is a small sandbox: try an idea and see what happens.
Cosmic Simulator — Build and Evolve a Universe
Trigger a Big Bang and watch matter form stars, planets, neutron stars, pulsars, quasars, and black holes.
Open game
Magnet Factory — Physics Puzzle Game
Guide a metallic ball through physics puzzles, or build your own route with permanent attraction and repulsion magnets.
Open game
Falling Sand 3 — Heat and Material Sandbox
Explore heat and material reactions in Falling Sand 3. Melt ice and wax, mix lava with water, and build experiments with continuous generators.
Open game
Ripples — Wave Interference Simulator
Explore wave interference with two sources in a free ripple tank simulator. Adjust frequency and amplitude, compare borders, and save your setup.
Open game
One Man Band — Free Online Music Loop Maker
Build a browser beat with a 16-step sequencer, drums, bass, keys and horn. Change tempo and swing live, then share your rhythm.
Open game
Falling Sand Game — Play Free Online
Play the classic falling sand game online. Draw sand, water, oil and fire, build walls, and save your sandbox creations. No download or sign-up.
Open game
Falling Sand 2 — Lava and Acid Sandbox
Experiment with lava, acid, water and sand in Falling Sand 2. Paint particle scenes, save a snapshot, or download your creation to continue later.
Open game
BioSim — Artificial Life and Ecosystem Simulator
Explore an artificial ecosystem with herbivores, carnivores and hybrids. Change food supply, observe populations, and inspect individual agents.
Open gameTry an idea
Step-by-step experiments
Set up a scene, change one condition, and compare what happens.
Artificial ecosystem experiment: change the food supply
Use BioSim to compare food supply settings and observe herbivores, carnivores and hybrids. Record what changes without assuming a fixed outcome.
Read experiment →Falling Sand experiment: ice, heat and lava
Build a small material experiment in Falling Sand 3. Compare ice with and without nearby heat, then observe what happens when lava meets water.
Read experiment →Wave interference: an experiment with two sources
Compare one wave source with two in Ripples. Change their spacing, observe interference patterns, and save a setup for your next comparison.
Read experiment →Beyond the screen
Games, toys and science
Ideas for play beyond the screen: brain teasers, board games, science activities and geek gadgets.
Geek curiosities
Macropads: what is a keyboard with so few keys for?
Design a small shortcut panel. Compare mechanical keys, knobs and display buttons through Keychron Q0 Max and Stream Deck Neo.
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Geek curiosities
LEGO SMART Play: how does a brick know what you are doing?
A brick responds to movement with light and sound. Explore LEGO SMART Play and the difference between All-in-One and Compatible sets.
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Geek curiosities
Kinetic desk toys: it looks like rising, but it is only spinning
A spiral seems to travel without going anywhere. Explore motion illusions and what to look for in a kinetic desk sculpture.
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