Free · Send lava down a stone mountain

Cellular Volcano Builder for Kids

Add bright lava inside a stone mountain and watch the hot cells find paths down both sides.

  • Clear, kid-friendly steps
  • Private in your browser
  • No signup

Creative cell experiments

Cellular volcano builder

Add lava inside the stone mountain and watch bright cells find a path down its sides.

Active cells 0 Steps 0 Brush Lava Opening experiment
The stone mountain has an open center. Paint lava inside, then start motion.Draw on the experiment. Arrow keys move the keyboard cursor; Enter paints.

Runs only in this tab with Sandspiel’s local WebAssembly core. No login, gallery, chat, ads, uploads, or saved creations.

Powered by Sandspiel, an open-source library available under MIT.

Three simple steps

How to use it

  1. Choose a material and draw on the large experiment area.
  2. Pick a motion speed, then start, pause, or undo while the cells change.
  3. Reset to restore the starter scene. Nothing is uploaded or saved.

Private by default

Your words and choices stay in this browser tab. There are no accounts, uploads, ads, or trackers inside the tool. Close the tab and the working data is gone.