Although it is a very simple game it did win over the hearts of millions. Flappy bird is a game where you have to guide a bird through pipes. Some people get very angry at the game and it caused a lot of problems. Many people did get angry at the maker and this may have been the reason for him taking the game down.
It is still making the developer money though as those who do have the game still see the adverts. Money is also made from people who sell their devices with the game on E-Bay saw a phone on sale for £150,000. This shows that you can still get the game if you wish.