Challenger: Roleplaying Game Core Rules
A new Challenger is here...
This is a pen and paper tabletop roleplaying game, not a computer game. If you're looking for one of those, I'm afraid you'll have to look elsewhere. I highly recommend the dungeon-crawling German rogue-like "Lost Labyrinth" which is free to download and a purely awesome game.
If you're interested in the RPG, you've come to the right place.