In Little Alchemy students begin with four elements, fire, earth, water & air, and then make different combinations to create new things.
They can then progress to make more complicated things such as planes, yoda (the character form Star Wars!), animals, supernatural beings, inventions and lots more. It is really good for project work with students reporting back to the class on what they have made.
I use it to introduce the zero conditional and get them to explain to each other what they have made e.g. ‘If you add earth to water, you get mud’. There is also an app which is free to download.