On the other hand, I know about a Free Software clone of a game that used the original graphics and music. Not quite legal, but the game was very old and the ri

On the other hand, I know about a Free Software clone of a game that used the original graphics and music. Not quite legal, but the game was very old and the right holders obviously didn't care. However, after publishing the project got a little fan base that eventually included graphic designers and musicians, who replaced the proprietary stuff step by step with their own creations. So the game changed from "legally-grey" to "solid free". This would never have been possible if the game hadn't been published. I voted you up specifically for this bit. This is great. What game was cloned, and what is the name of the clone?