Little Alchemy 2

A game where you basically add 2 things together, and either end up with a new item, a item you already made, or nothing at all. You start with earth, air, fire, and water. You can go all the way up to tank and pizza.

Bob: Hey want to play a game
Jimmy: yea
Bob: I have 420 elements in Little Alchemy 2
Jimmy: I have 421
Bob: :O