The Xbox 360 and Xbox One versions of Minecraft are free to play this weekend. In fact, if you've got an Xbox you can download it from the store right now. You can also try out Xbox Live, Xbox's online service. The offer runs until May 21.
That means for this weekend you can play with friends and mortal enemies online, and without having to pay for Xbox Live.
Most people probably already have Minecraft, to be honest, but if you haven't you can seize the opportunity and find out if you're well into cubes and that.