This minecraft exploit works on both multiplayer and single player. It doesn’t require any programs or downloads, just follow the video in game. As the video itself says, once you learn how to do this you can do it pretty much at any point. It can really give you, or your team if it’s a group pvp server or something, an edge.
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With a little practice it’s easy enough to do. Shouldn’t take more than a minute or two to get it the first time and after that you’ll be able to do it pretty quickly. For something similar (and a little easier) try the minecraft wallhack.