DayTrippers is a reality-hopping roleplaying game of surreal science fiction, written by Tod Foley (designer of the "CyberSpace" RPG and other material for Iron Crown Enterprises). The game blends a traditional "OSR" approach with modern "narrativist" approaches to gamemastering, resulting in highly personalized and unpredictable adventure sessions.
DayTrippers was originally conceived by Mike Burrell and Tod Foley in a discussion on the story-games.com forum in 2014, where it quickly became an open-source development project. The Source Rules were released under the Creative Commons CC-BY license in October of 2014, and Foley began work on a custom "branch" of the rules known as the "Core Rules". These Core Rules expanded the DayTrippers universe extensively, and have since given rise to the "DayTrippers GameMasters Guide" and several supporting adventure modules.
The DayTrippers Core Rules book includes rules for character generation, action resolution, ship construction, combat and character advancement, as well as a "GM-Lite" set of rules for collaborative play. The DayTrippers GameMasters Guide takes the OSR path by providing a set of tables, additional supporting rules, random content generators and a unique adventure prep system for more strongly-GM'd campaigns. The game may be played in either mode.
DayTrippers is set in the early years of the 22nd century, when the development of the "Slip Capacitor" has made it possible to travel to other dimensions and pocket universes in vehicles known as "SlipShips." The catch, however, is that these adventures are short-lived: It is not possible to remain "outshifted" from "Home-Earth" for longer than 24 hours. This narrative conceit makes a DayTrippers campaign rather like a series of "one-shots" tied together in a loosely episodic manner, similar to a modern television series. The game makes use of surrealist literary techniques for developing content, employing an "oracular" approach to adventure generation which enables the GameMaster to emulate both surrealistic works of classic "pulp" science fiction and the "New Wave" science fiction of the 60s and 70s. Foley has stated that key influences on the design included the works of Moebius (Jean Giraud), Michael Moorcock, Rudy Rucker, Stanley G. Weinbaum, Robert Heinlein, Jack Vance, and other "masters of weirdness."