To Challenge Tomorrow: Role Playing Past, Present, and Future Science-Fiction and Historical Rules
To Challenge Tomorrow 1st Edition presented a surprisingly complete and modern role-playing game with a focus on detail and realism. The system inherited many aspects of the Ysgarth fantasy system, including a classless Skill system.
The first edition of To Challenge Tomorrow was sold as a box set (three booklets and character sheet), (apparently) as a bagged set of three booklets, and as individual booklets. The box/bag set included: