Introduction: Simple TNT Cannon
I will show you how to make a simple TNT cannon.
Step 1: Base
Make the base like I did.
Step 2: Light
Place to TNT, light the back one, wait two seconds, then light the first one.
I tried to make a redstone one but it failed.
Here are some of my other minecraft instructabes:Flan's Mod, Sugar Cane Farm, Piston Door.