basically just a site full of retro console games which you can play on your pc
im not to sure if every game is on there but there is quite a lot for all the old consoles like the atari, snes, nes, sega, sega genesis, gameboy and so on
all the games on here run in a web browser but if your having problems running the games all you gotta do is download the arcade ox plugin for firefox and it will allow you to play the games
http://retrouprising.com/ <-- the link
btw a must play game is the michael jacksons moonwalker game on the sega
ENJOY