It's done! This is made ALL out of redstone, making it easy to use for single player worlds! To start, press the button in the spawn. If this doesn't work, please tell me and I will update it! There are 9 waves of tne zombies, then 1 wave of twenty, this repeats NINE times, On the tenth, comes the 'boss' round. Yes, the pictures include skeleton horses, YES, this is VANILLA! No mods or plugins needed. So, download, play, favorite, comment, diamond and subsribe! :)