Skip to content
Written in C++ and using SDL, The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox, it simulates air pressure and velocity as well as heat.
Branch: mod-1
Clone or download
Pull request Compare This branch is 2100 commits ahead, 280 commits behind ThePowderToy:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.

The Powder Toy - November 2017

Get the latest version here:

To use online features such as saving, you need to register at: You can visit the official TPT forum here:

Have you ever wanted to blow something up? Or maybe you always dreamt of operating an atomic power plant? Do you have a will to develop your own CPU? The Powder Toy lets you to do all of these, and even more!

The Powder Toy is a free physics sandbox game, which simulates air pressure and velocity, heat, gravity and a countless number of interactions between different substances! The game provides you with various building materials, liquids, gases and electronic components which can be used to construct complex machines, guns, bombs, realistic terrains and almost anything else. You can then mine them and watch cool explosions, add intricate wirings, play with little stickmen or operate your machine. You can browse and play thousands of different saves made by the community or upload your own - we welcome your creations!

There is a Lua API - you can automate your work or even make plugins for the game. The Powder Toy is free and the source code is distributed under the GNU General Public License, so you can modify the game yourself or help with development. TPT is compiled using scons.

Build instructions

sudo apt-get install build-essential libsdl1.2-dev libbz2-dev zlib1g-dev liblua5.1.0-dev git scons libfftw3-dev

For a list of flags for scons, see


  • Stanislaw K Skowronek - Designed the original
  • Simon Robertshaw
  • Skresanov Savely
  • cracker64
  • Catelite
  • Bryan Hoyle
  • Nathan Cousins
  • jacksonmj
  • Felix Wallin
  • Lieuwe Mosch
  • Anthony Boot
  • Matthew "me4502"
  • MaksProg
  • jacob1
  • mniip


Click on the elements with the mouse and draw in the field, like in MS Paint. The rest of the game is learning what happens next.


Key Action
TAB Switch between circle/square/triangle brush
Space Pause
Q / Esc Quit
Z Zoom
S Save stamp (+ Ctrl when STK2 is out)
L Load last saved stamp
K Stamp library
1-9 Set view mode
P / F2 Save screenshot to .png
E Bring up element search
F Pause and go to next frame
G Increase grid size
Shift + G Decrease grid size
H Show/Hide HUD
Ctrl + H / F1 Show intro text
D / F3 Debug mode (+ Ctrl when STK2 is out)
I Invert Pressure and Velocity map
W Toggle gravity modes (+ Ctrl when STK2 is out)
Y Toggle air modes
B Enter decoration editor menu
Ctrl + B Toggle decorations on/off
N Toggle Newtonian Gravity on/off
U Toggle ambient heat on/off
Ctrl + I Install powder toy, for loading saves/stamps by double clicking
~ Console
= Reset pressure and velocity map
Ctrl + = Reset Electricity
[ Decrease brush size
] Increase brush size
Alt + [ Decrease brush size by 1
Alt + ] Increase brush size by 1
Ctrl + C/V/X Copy/Paste/Cut
Ctrl + Z Undo
Ctrl + Y Redo
Ctrl + Cursor drag Rectangle
Shift + Cursor drag Line
Middle click Sample element
Alt + Left click Sample element
Mouse scroll Change brush size
Ctrl + Mouse scroll Change vertical brush size
Shift + Mouse scroll Change horizontal brush size
Shift + R Horizontal mirror for selected area when pasting stamps
Ctrl + Shift + R Vertical mirror for selected area when pasting stamps
R Rotate selected area counterclockwise when pasting stamps

Command Line

scale: Change window scale
kiosk Fullscreen mode
proxy:server[:port] Proxy server to use [Example:]
open Opens the file as a stamp or game save
ddir Directory used for saving stamps and preferences
ptsave:#[name] [Example: ptsave:2198#Destroyable_city_5_wth_metro~dima-gord]
You can’t perform that action at this time.