minetest.register_craft( {
        type = "shapeless",
        output = "gloopblocks:rainbow_block",
        recipe = {
                "group:basecolor_red",
                "group:excolor_orange",
                "group:basecolor_yellow",
                "group:basecolor_green",
                "group:basecolor_blue",
                "group:excolor_violet",
                "default:stone",
                "default:mese",
        },
})