It started out as a PC RPG with some semi-real-time battle scenarios, but I believe it may have come out for Xbox as well..don't quote me on that, though.
Yeah, Fallout 1 and 2 started out as PC games, they were about the apocalypse. Fallout 3 is a video game that was released on Xbox 360, Playstation 3, and PC last year. It revolves around a retro world set in the future, but still has a 50's type theme to it. A Nuclear War has raged on, and the world turns into a Wasteland. Most people go into underground vaults, where they live life safely from the radiation and dangers of the outside world/wasteland. In the game you build your own character, a person who was born in Vault 101. Your mother has died giving birth to you, and live with your father (Who's played by LIAM NEESON. Awesome.). But suddenly, when your father goes missing, you must leave the Vault and enter the Wasteland in order to find him. You encounter dangerous creatures, whom you must fight, and must choose to be good or evil. The game is amazing with it's great way of storytelling, cinematic and awesome action gameplay, and revolves deeply on the power of choice. Highly recommend anyone with a 360, PS3, or PC should buy it. One of the best games I've ever played.
Did I mention the game stars Liam Neeson?!?! And there are narrations by Ron Perlman! Yes.