Markus Persson, creator of the game Minecraft, has been blocked by Microsoft to attend the game's 10th-anniversary event in Sweden over his "comments and opinions". Persson has made insensitive comments on Twitter, including "it's ok to be white" and a now-removed tweet about "heterosexual pride day". He sold Mojang, the studio behind Minecraft, to Microsoft for $2.5 billion in 2014.