this is a SEMI AUTOMATIC TNT CANNON more big than regular tnt cannon. now when you push the button infront of were you spawn, it will push tnt to launch and it will launch a tnt quite some distance..

how to upload it: unzip the zip folder and place the folder inside youre saves folder in .minecraft and launch minecraft

how to opperate: press the button infront of were you spawn witch will activate the cannon

how to reload: once all the tnt is gone, delete all the sand at the bottom and then place 12 stacks of sand on top
of the pistons, then place one row of tnt at the bottom until you reach the water