In this simple instructable I will show you guys how to make a TNT cannon in pocket edition you can also make this in xbox and PC version.

Step 1: You Will Need

1. TNT
2. obsidian/bedrock
3. water
4. Half slab

Step 2: Create Your Platform

With obsidian/bedrock create at two layered 3 by 5 play platform

Step 3: Add Water

Now dig a a 1 layer 1 by 3 line this will end up with you having a hole on the side of the platform add a half slab there. Now just place water to create a stream

Step 4: Build Up

Build one block up on either sides on the edge

Step 5: Lock, Load, and EXPLOAD!

First place a TNT near the opening then place one between the two blocks sticking up. Light the bottom one and...
Wait 1 second and ignite the top one (TNT block will explode in mid air best for use when plat form is near ground)
--or--
Wait five seconds and ignite top one (TNT block will land on the grouse then explode best for use when platform is high off the ground)