Robert Nay was only 14 years old when he developed (active) Bubble Ball, a 72-level physics puzzle game. In the first two weeks of its release it was downloaded (passive) two million times from Apple iTunes. Not bad, when the average mobile game only receives a few hundred downloads. Bubble Ball has overtaken (active) the hugely successful Angry Birds, and has become (passive) one of the top free app games. Nay wanted to develop an app that could be used (passive) by children of all abilities. The puzzles range (active) from simple to very challenging. At each level, you are given (passive) tools to help you complete the level. 'My friend's dad suggested (active) I try to make an iPhone app, and I thought it would be really cool and decided (active) to give it a try... I came up with the idea for the game by myself, but it was influenced (passive) by other games I liked,' said Nay. Bubble Ball has now been downloaded (passive) over 16 million times, and Nay now has his own game development company. His advice to young people is: 'You can do amazing things if you just try!'