From publisher blurb: Retrocausality is a tabletop RPG about time travel, in the vein of Bill & Ted's Excellent Adventure or Back to the Future. Its rules-light, card-based system lets you decide how time travel works. Do you have a specific movie you want to emulate? Do you have Opinions on the Novikov self-consistency principle? Do you prefer not to ask too many questions? Retrocausality can make that happen, and more. Designed to be playable with a deck of playing cards. Convention-friendly character creation: a list of the things you're good at and the type of time travel shenanigans you prefer will do. Rules-light, complex outcomes: Every result is a success or failure, and may also be excellent or bogus, creating a wider variety of outcomes with every challenge. Face cards and Aces have special results on skill checks, to make things more interesting. Time travel rules split actions into their focus (what you're interacting with) and method (the how). Without a specific list of allowed time travel actions, you're free to do what you want! The rules are so light you can use Retrocausality to run a time travel adventure in a different game. That's twice as much game. A guide to support tools that will help make your time travel adventures even better. There's art of a time traveller high-fiving Obama after making Karl Marx a US President. I will not be taking questions. This 60-page book comes with full-colour art from a bunch of great artists, sample characters, advice on running time travel games, and a tacit admission that I have read Homestuck.