1:you need TNT 2: you need 1 bucket of water 3:make a cannon 1 TNT is amo 4:your done [if made good plz make a target to see how far you can get the TNT to hit then try again and see how long you can get it to plz make a cool looking cannon or just make a TNT cannon plz try to make it look cool] [idea] if you have a clan in minecraft you can make a wall with alot of cannons if people what to kill you!!!!!! you can kill them also u can be EVIL and kill some one with your own!!!!!!!!!!!!!!!!!!!!!