GURPS 3rd edition, revised.

Adventure in any world you can think of, with GURPS, the Generic Universal RolePlaying System – the most flexible roleplaying system you can use. If you haven't yet upgraded to the Fourth Edition . . . you're a completist . . . or you're looking for a dose of nostalgia, here's the previous edition! It's easy to learn – you can jump right in with quick-start rules, pre-designed characters, and an easy-to-play solo adventure you can download for FREE! The Basic Set is designed to be "Game Master friendly," with a Table of Contents, Glossary, Appendix, and Index, as well as lots of examples.