publisher blurb Retrocausality is a science fiction roleplaying game where you can immerse yourself in a world where time is yours to command, and it causes all the problems you were hoping it wouldn't. This rules-light game is designed for running quick time travel adventures in the vein of Bill & Ted's Excellent Adventure or Back to the Future. Save the world in your time-travelling minivan, goof around in time periods you shouldn't, or just paste the time travel rules over the system of your choice and stab dragons in your adventurer's distant past. It's all good! Designed for veterans and newcomers alike, the core book offers a simple system and all the tools you need for an excellent adventure.