We've seen the success of agar.io, and there is a clone called chopcoin (find more info by using the search function on this website).
Well now the new sensation is slither.io: A game where you are some sort of snake. I think we need a clone that adds the ability to gamble with money, and steal other people's money, and by money I obviously mean Bitcoin.

Ideally we should make the official slither.io game accept Bitcoin and integrate it but I doubt they will bother, so maybe someone can make a clone and make it work.