In-browser falling-sand simulation game with over 500 elements and thousands of reactions.
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slweeb 342504b04c Version 1.13.1 - December 18, 2025 - G&G Hotfix
~ This is a quick group of bug fixes and improvements following yesterday's update.
+ More Shift-Select functionality:
    + Fuse can turn into an element after charged
    + Filler can turn into an element after cloning itself
    + Heat and Cool tools can specify limits
    + Paint tool can specify a specific element to paint
    + Udder can dispense a specific element
    ~ Distinct border for Shift-Selected element buttons
~ Chlorine Ice kills Virus like gaseous and liquid forms
~ When window is shortened vertically, canvas will shrink to fit screen
[Bug Fixes]
~ Fixed: 2- and 4-wide brushes aren't possible with scroll wheel
~ Fixed: Tea doesn't stain Paper very well
~ Fixed: Fireflies change the color of any pixel they touch
~ Fixed: Slow Cloner can't clone more than one element with Shift-Select
~ Fixed: Slow Cloner doesn't immediately grab element
~ Fixed: E-cloners can clone Walls
~ Fixed: Outline View uses white outline with custom URL backgrounds
~ Fixed: Heaters, Coolers, and Cloners can be mixed without holding Shift
~ Fixed: Language isn't autoselected for Brazilian Portuguese or Chinese
[Technical]
+ chargePixel(pixel, amount?) helper function to easily shock a pixel
+ burnPixel(pixel) helper function to easily ignite a pixel
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README.md

Sandboxels

A falling sand simulation game with hundreds of elements, heat simulation, chemical reactions, fire, density, electricity, and more.

Play for free at Sandboxels.R74n.com.

Join the Discord server.

Landscape made in Sandboxels

Modding

New to modding? Read the Sandboxels Wiki articles on getting started with modding or publishing your mod.

Please read the Contribution Guidelines before submitting your mod.

Controls

  • Left Click = Draw pixels
  • Right Click = Erase pixels
  • Middle Click = Pick element
  • Space or P = Pause simulation
  • Shift + Heat/Cool/Shock = Intensify effect
  • Shift + Click = Draw line
  • Scroll or +- or [] = Change cursor size
  • ←→ = Change category
  • E = Select by name
  • I or / = Element info
  • \ = Open settings
  • > = Single step
  • F or F11 = Fullscreen
  • 1234 = Change view
  • F1 = Toggle GUI
  • C or F2 = Capture screenshot

(Alt/Option can be used in place of Shift)

Button Info

  • Pause = Pause/play the simulation
  • Step (>) = Run a single frame
  • Minus (-) = Decrease the cursor size
  • Plus (+) = Increase the cursor size
  • Reset = Clears the entire simulation
  • Replace = Overrides pixels when placing
  • E = Select any element by name
  • TPS = Change how fast the simulation runs
  • Info = Open the element info screen
  • Saves = Open the Save & Load menu
  • Mods = Open the Mod Manager
  • Settings = Open the settings menu