The Butterfly Effect is a free and open source game that uses realistic physics simulations to combine lots of simple mechanical elements to achieve a simple goal in the most complex way possible. The Butterfly Effect has been over five years in the making.




The Butterfly Effect is the most popular Windows, Mac & Linux alternative to Principia.
The Butterfly Effect is the most popular Open Source & free alternative to Principia.
- The Butterfly Effect is Free and Open Source


































































