TNT Cannon

This is a TNT cannon made out of obsidian.

Features of the Cannon itself:
-Shoots TNT which destroys everything
-2 different range settings(short&long)
-Nice design made out of obsidian and wood
-Infinite amount of TNT

Features of the world:
-Includes a testing area made out of sand
-Take revenge of creepers by spawning masses of them in the testing area!
-Infinite Daytime & No hostile mobs if you don't spawn them yourself
-Includes also the Human Cannon

Additional Notes

You need atleast version 1.5, otherwise this cannon won't work.