online game Minecraft can be cause for concern for parents, who see their children spend endless hours immersed in cyber-world. However, for 23-year-old English man, game has made him millions of fans and good deal of money too. Joseph Garrett makes full-time living by making YouTube videos about his exploits in Minecraft. He gets up to 30 million hits week, which is more than official Justin Bieber and One Direction channels. His uploads might also make him small fortune, without having to leave his bedroom. He has become celebrity in Minecraft gaming community. He told BBC: "I'm really happy, I'm not going to lie, I think I've got best job in the world." Minecraft has over 100 million registered users around world. Education professionals are saying it could be very useful tool in classroom. website gamepedia.com says: "Minecraft can have huge educational benefits for children; it can help teach numerous subjects both with and without adult involvement." It added that: "Learning in Minecraft can be faster than traditional methods of education, as children are often far more motivated, get more practice, and feel that what they are learning is useful." site says children naturally pick up skills in reading, writing, maths, geometry, music and science while playing game. They can also learn social skills and computer coding.