Computer - Press the E key. Pocket Edition - Tap ⋯ Console Edition - Press the X (Xbox) or square (PlayStation) button.
16 blocks - These can be anything from wool to diamond, but iron or obsidian is preferred. 1 slab - This can be any material. The best material to use is quartz. 11 redstone 1 bucket of water 2 levers 5 TNT blocks
Leave the middle block blank. You won’t put anything here, especially not redstone.
The redstone line should essentially extend the length of the water channel.
This TNT’s height will vary depending on how quickly you hit the left switch. If you do very quickly, the TNT will fly straight. Delay it 2-3 seconds, and the TNT will fly much higher. If you wait too long, however, the first block of TNT will just fly upward and explode. Don’t hit the left switch first, or your cannon might explode.
