Minecraft wiki entry for Spawn_jail, associated text: In Classic, if spawn jails are larger than one square block, then it is possible to break out of it. This does not work in later versions of Minecraft. Simply by pressing ↵ Enter, moving aside, then placing a block at the place you pressed enter, will get you out of the spawn jail (by pressing R to respawn). Fortunately, most servers ban people who build in spawn jails. Using cheats can also allow you to break out of a spawn jail, where this is also frowned upon.