Now jump down and click on the thing you want to duplicate until the furnace breaks. The furnace should break and appear again. Next, hop onto the furnace and start mining it with your pickax, but switch to your shovel just before the furnace breaks. Begin by placing a furnace anywhere you like, then place a single unit of the item that you wish to duplicate within the ingredient slot. Make sure that you have an iron pickax or better, an iron shovel, multiple furnaces, and a chest. If you'd like to duplicate items but don't have a friend handy, you still can. Submitted by: ninjadragon1001 Solo Duplication Glitch Now move on to the next one and so forth. Hold X and place one until it fills up the slot with 64. Finally, head to a chest and drag your item to an empty slot. Doing so will leave behind 64 of that item. Move that item to a different position in your inventory. Open your inventory and check your inventory, where you need to have a unit of the item you are duplicating. Walk over to the item and stand on top of it. However, the item cannot be picked up normally. Now have a friend break the dispenser and the item will drop. Move your cursor over it and hold the A button. Put one of that item in your dispenser, and another one of the same item in the slot of the furnace where the coal does not go. Make sure you have a friend handy, and several of the item that you want to duplicate. For now, though, you can duplicate any item in the game by carefully following a few steps. This cheat may not work in the future, following subsequent patches. Submitted by: Cherished99 New Duplication Glitch You'll find a lever that you can pull to produce a portal to the Nether. Gather enough dirt to build a staircase that reaches the word MINECRAFT that is floating in the sky. Start playing the Tutorial mode with the game set to Peaceful. Submitted by: OneStorm94299 Secret Nether Portal
You can keep repeating the last step as desired. Now open a chest and press and hold the X button to place the whole stack in the chest. In your inventory, you should see 64 of the object in question. Toss out the normal one and grab the glitched one. One of those is normal and one is a glitched. When the dispenser finally breaks, two of the same item will appear on the ground. If you're doing it properly, the item will be placed and removed from the container repeatedly. Have your friend begin breaking the dispenser with a pickax and while he or she is doing that, press and hold the A button. Place the item that you wish to duplicate in the dispenser. Play the game with a friend and make sure that a dispenser has been placed. It may also not work following subsequent patches to the game.
Note that this glitch doesn't always work, but it does have a high probability of duplicating items.