Minecraft wiki entry for Halloween_Update, associated text: The update was announced on October 4, 2010 on Notch's blog.[1] A new type of block was announced on October 8, and on October 11 Notch posted a statement on his Twitter saying: "I just made the most unfair mob ever even more unfair. You will hate the Ghast."[2] On October 10, 2010, Notch posted the first image of The Nether on his blog.