Barrels that launch you like a cannonball are a common mechanic in any of the 2D Donkey Kong Games, so it is no surprise to see them in Donkey Kong Country Returns HD. In fact, the fifth level of the first world features them heavily. Of course, you will also need to figure out how to use these barrels to reach the letters and puzzle pieces if you want to 100% Canopy Cannons. Here is where all of these collectibles can be found.