Year of Publication: 1977
Publishing Company/Creator: Game Designers’ Workshop (GDW)
The original editions of Marc Miller's Traveller, the game is known for it's terms-based life-path style character generation. Other features people remember are it's 2d6 resolution mechanic, and it's use of hexadecimal codes to summarize character stats, planet profiles, etc. While the hexadecimal thing may make the game seem confusing, it is not a particularly heavy game mechanically. This game is sometimes thought of as being to Sci-fi as D&D is to Fantasy, as far as being the early and primary "main game" of the respective genres.