To put it simply: "Jumpchain might be described as a “singleplayer, GM-less roleplaying game”. It’s not a CYOA in the traditional sense, where you have a pre-written story and you make choices to go down certain paths. All Jumpchain content is fan-made. You make a character, choose abilities and powers and whatnot, decide on problems and situations for them to face, and then the actual story is made up by you. The basic premise is that the Jumper (who can either be a self-insert of yourself or a separate character) is Jumping from world to world, from one fictional setting to another, making one big Chain of Jumps. Jumps generally last for 10 years, after which you head to another Jump. You are able to purchase things like Perks, Items, and Companions in each Jump, using a points budget. Perks can be things like enhanced skill, powers like flight or magic, or bonuses like enhanced luck. Items are special items, such as an enchanted sword, a spaceship, piles of gold, etc.. Companions are characters that follow you to new Jumps, they can be canon characters who you convince and recruit to join you or original characters that you create. You keep whatever purchases you make as you go through different Jumps, accumulating them over time. If you run out of points and want more, you can take Drawbacks, problems to face, such as being framed and becoming a wanted criminal or losing access to your powers. Drawbacks do not carry over between Jumps. Once the Jump is over, they go away and you are free from them. The documents that detail Perks, Items, Drawbacks, Companions, and so on are generally called Jumpdocs. They are how you play Jumpchain. After making purchases and creating the build for a Jump, the story of what actually happens in the Jump is for you to decide. Jumpchain by itself does not have rules or mechanics dictating what can and cannot happen. It’s totally up to you. You can imagine what you would do in the situations you face and find ways to solve them, make it like a story with plot, add your own rules and mechanics to play it like an normal RPG, or just do a power fantasy or daydream where you use your knowledge of canon and your purchases from Jumps to do whatever you want. The very first Jump ever made was the Pokémon Trainer Jump by someone named Quicksilver. It may be a good introduction and starting-off point if you want to play Jumpchain. It’s linked in the “Main Drive” in the pinned post I mentioned before, under “Quicksilver’s Jumps”. Other important Jumps for starting off are the Body Mod Supplement, which allows you to create a new body for yourself and acts as your base level, and the Cosmic Warehouse Supplement, which gives you a place to store anything you want over the course of your Jumps. Many Jumps will have stuff connecting to your Body Mod and Cosmic Warehouse." - Reddit user Qjvnwocmwkcow Source: https://old.reddit.com/r/JumpChain/comments/kizx1j/what_is_jump_chain/ggudezl/