Little Alchemy 2 is a crafting game, in which you combine elements to create new materials and objects. To make Coal in Little Alchemy 2, you will need to first combine Fire and Earth elements to create Lava. Once you have created Lava, combine it with Stone to create Coal.
If you’re looking for more tips and tricks, then there are some great guides online that you can use to get the best out of your crafting in Little Alchemy 2. You can also find some additional elements that can be created with a combination of other materials.