Minecraft?

The girls have been begging me to buy Minecraft to install on my iPad. I see them playing it on their iPhones and it seems to be a really addictive game. I prefer they spend more time on their studies. :P The only reason they want me to buy it is so that they play Minecraft on a bigger screen (on my iPad)! Not sure if I want to buy it... Maybe if they do well for their end of year examinations, I will definitely, seriously consider buying it. :)