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.