Tutorials/TNT cannons/t-gun

Layers are numbered from bottom to top.

Make a normal cannon barrel, then break the blocks to the sides of your mounting block. There will be TNT to direct the shot. Then, place water 2 blocks to the sides from your main "barrel". You can prevent it from pouring everywhere by placing blocks (e.g. slabs as in the schematics) around these troughs. Then, place a button on the back of your cannon, connect it to the main TNT charge by placing the wire on the left side of the main barrel. Next