Atom Smasher
About
Now you can live the childhood dream, the universal desire everyone had as a kid: building your own linear accelerators!
If you enjoy geeky construction/puzzle games, I think you'll like it.
It's an engineering game, although the physics involved are not the sort you find in a bridge-building simulation. It's got some odd concepts in it, but I think you can figure it out if you start from the top.
If you decide you do need a tutorial, you can find some videos here:
http://youtu.be/sm-YFPqtsU8
http://youtu.be/d8GKRI87-mk
LATEST RELEASE: Windows 2014-11-8 (Feature complete)
Linux/MAC 2014-11-26
This project is largely finished! Not 100% sure about the Linux/MAC version, let me know whether they work for you or not.