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Play, Create and Share in the Rilouworld!

Rilouworld is a decentralized game universe in which players can explore worlds made by others.


You like playing games, but most of all, you like sharing what you do in games with others ? This project is for you. The goal is to create a shared plateform for creating small "worlds", play them with your friends, and share them with the community.

Rilouworld started as a game engine for a multiplayer RPG/plateform game, and evolved into the idea that anyone would be allowed to modify how the game works. From the mechanics, to monsters, quests and magical spells, I wanted to give anyone the power to make the game their own.

How does it work?

You can install Rilouworld, start the program and connect to the main Rilouworld server. It will list all the worlds you can enter. Jut choose one and start playing! (not ready yet)

Can I make my own world?

Of course! You need to create a new world file, and use Rilouworld's Quest language to describe places, monsters, objects, quests...etc

It looks like this (work in progress):

#lang rilouworld/quest
(from spacecat use player troll star)
  (name "Spacecat")
    (animation spacecat-anim "spacecat/spacecat.png" (size 34 21) (durations 4 4 4 4 4 4))
    (image space-bg-img "spacecat/space-bg.png")
    (image bg-star-img "spacecat/bg-star.png")
    (image star-img "spacecat/star.png" (rect 0 0 10 10))
    (image troll-img "spacecat/troll.png" (rect 0 0 10 10)))
    (zone space
      (name "Space")
      (rectangles (rect 0 0 32 24))
        ;; the space background scrolling behind the scene
        (scrolling-bg (image space-bg-img) (direction left) (speed 0.2))

        ;; an area that spawns background stars
          (rect 0 0 512 384)
            [(freq .2) (particle (image bg-star-img)
                                 (pos <x> <y>)
                                 (direction left)
                                 (speed .30))]))

        ;; an area that spawns trolls and stars
          (rect 512 0 16 384)
            [(freq .5) (troll (image troll-img) (pos <x> <y>))]
            [(freq .01) (star (image star-img) (pos <x> <y>))]))

        ;; a test star
        (star (image star-img) (pos 100. 100.))

        ;; the player
        (player (image spacecat-anim) (pos 50. 256.))


This file creates a world in which a colorfoul cat runs infinitely through space and catches stars.

Ok, I made my game, how do I share it?


Complete guides and documentation

Visit the complete Rilouworld documentation here.

Under the hood

Rilouworld is powered by Racket, the language-oriented programming language. It allows us to create Domain Specific Languages for video games.


Rilouworld is distributed under the terms of the GNU General Public License version 3. Copyright © 2018 - Jérôme Martin

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see


Decentralized game universe in which players can explore worlds made by others.




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