Katawa Shoujo, the game about dating disabled teens, has been in the works for over a decade. It's from members of webforum 4chan, and over twenty developers worked on it.

The game is now finished and available for download. If you'd like a better idea of what you are getting yourself into, check out the game's trailer—which, interestingly, quickly shows how the title came to be and evolved over the years.

18禁ゲーム「かたわ少女」PV [YouTube]