are you talking like the water boundry? or the boundry that kills you if you go too high up the mt? those you cannot delete. maybe you should save your map as something other than a default map name. either that or your just an idiot (sorry for being so blunt im just to lazy to explain why) nvm ill explain before the flames come. when you save a new map, you dont save a default one. you save a new copy of the default one. so if your deleting the boundaries. it wont work in MM or anything, customs will if you load up your map varient. but chances are, the game wont let you save the same map name as a default forge world map [Edited on 10.01.2010 1:44 AM PDT]