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You'll need 5 pieces of gunpowder in order to craft a piece of TNT. Gunpowder cannot be crafted, and must be found by defeating certain enemies that have a chance of dropping some, or looking in certain chests that have a chance of holding some:  Defeating creepers (before exploding): 66% (1-2 gunpowder) Defeating ghasts: 66% (1-2 gunpowder) Defeating witches: 16% (1-6 gunpowder) Opening desert temple chest: 59% (1-8 gunpowder) Opening dungeon chests: 58% (1-8 gunpowder) You can use regular sand or red sand. Both work the same and can be mixed during the creation of TNT. You can find sand most commonly in the following biomes and areas:  Beaches Deserts Riverbanks Mesa (red sand) Use your crafting table to open the crafting grid. Place one gunpowder in each corner of the grid, then place the last piece in the center. ) Place sand blocks in the four open spaces left in the grid. This will create TNT. Drag the TNT from the result grid and add it to your inventory. You can now place it in your world to be blown up.
Find 5 pieces of gunpowder. Get 4 sand blocks. Open your crafting window. Place the gunpowder in an "X" pattern. Fill the remaining spaces with sand (or red sand, or a combination of the two. Add the TNT to your inventory.