Castles & Crusades is a fantasy role-playing game released under the Open Gaming License. Its designers sought emulate the feel of the origional Advanced Dungeons & Dragons game and other early RPGs, but streamlined using some concepts from Dungeons & Dragons Third Edition.
The system is called the SIEGE Engine:
- "The SIEGE Engine was the last name we came up with when writing the rules, to be honest. We didn't really have a name for it. That was more for marketing and legal reasons, to be honest, and something that Troll Lord could use and hang their hat on." - Mac Golden (source)
- Castles & Crusades at Wikipedia, the free encyclopedia.