Some lie, dusty and forgotten, at the bottom of a bargain bin. Others are hard to find outside of an eBay auction. Some received rave reviews, but sold next to nothing. Others sold well, but received almost no attention or love from the hardcore audience. Some you've heard about. Others you probably haven't.
All fifty games, however, are criminally overlooked. More importantly, all fifty were released for this generation of consoles and PCs, meaning you can still track down a copy and still play that copy on your current setup.
If you've finished all the blockbusters, or just want to give the underdogs a second shot, here's where to start.