Dong Nguyen created the mobile game Flappy Birds in a few days. It became a huge success, earning $50,000 per day and becoming the top free game on iOS and Android app stores. However, Nguyen then announced he was shutting the game down due to its overwhelming popularity. Flappy Birds involves flapping a bird up to avoid pipes, and its simple yet addictive gameplay made it hugely popular. Nguyen has since created other games but none as successful as Flappy Birds.