Skip to content


Subversion checkout URL

You can clone with
Download ZIP
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.
C C++ Other

add new minimumVersion setting in saves, can restrict the smallest ve…

…rsion of TPT that is able to open the save. Uses major/minor version for this

Also add RESTRICTVERSION macro to help when adding restrictions later
Also show errors when opening broken stamps now too
latest commit 63843c2bd7
@jacob1 jacob1 authored


The Powder Toy - September 2015

Get the latest version here:

To use online features such as saving, you need to register at:

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.


Stanislaw K Skowronek - Designed the original
Simon Robertshaw
Skresanov Savely
Bryan Hoyle
Nathan Cousins
Felix Wallin
Lieuwe Mosch
Anthony Boot
Matthew "me4502"


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.


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 + 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

Only the left Ctrl, Shift, and Alt buttons are enabled to work, not the ones on the right

Command Line:

scale:1                  Normal window resolution
scale:2                  Doubled window resolution
kiosk                    Fullscreen mode
proxy:server[:port]      Proxy server to use [Example:]
open <file>              Opens the file as a stamp or game save
ddir <directory>         Directory used for saving stamps and preferences
ptsave:<save id>#[name]  [Example: ptsave:2198#Destroyable_city_5_wth_metro~dima-gord]
Something went wrong with that request. Please try again.