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2021 Minetest GAME JAM [December 1st-21st] [$200 prize pool]
(forum.minetest.net)
Minetest is an infinite-world block sandbox game and a game engine, inspired by Infiniminer, Minecraft and the like.
The community is about the great and open source sandbox game writed in Lua, Minetest.
Feel free to call players for a multiplayer game or publish your project of a mod and everthing related.
Download the game. Check out the wiki.