http://www.phunland.com/wiki/Home
Phun is a "maker". Not a game, as such. At least, I wouldn't say it is.
Technically it's a physics & engineering program. It's EXREMELY similar to Working Model 2D.
More like the EXTREMELY simple version of Working Model 2D. And lol @ engineering. No serious engineer will use Phun to test anything.
But they may use it for weight tests... :O