https://www.minetest.net/ https://www.minetest.net/ would probably be your best option. There's a number of mods around education for it: https://wiki.minetest

https://www.minetest.net/ https://www.minetest.net/ would probably be your best option. There's a number of mods around education for it: https://wiki.minetest.net/Mods:Learning https://wiki.minetest.net/Mods:Learning And here's a somewhat elaborate discussion on using it in class: https://forum.minetest.net/viewtopic.php?f=3&t=9482 https://forum.minetest.net/viewtopic.php?f=3&t=9482 It also has a really good modding API in Lua, which you could probably get middle school students to have fun with and actually create something in a video game.