To get Donkey Kong stickers what is needed to do is press downB and then a sticker will appear you need to get it and if you want to see how the sticker looks like you'll need to search in the sticker book at the menu.
Press B to roll then press A while rolling and you can reach higher things
Exit Completed Levels
If you are in a level you have already beaten, then press Start then Select.
In Jungle Hijinxs go up in the trees and use long jump. Get the lives. Go back to DK's treehouse, and get that life. It will restart all the lives except in the treehouse. So you can get many lives. You could also restart it by going in a cave. Then when your done exit out if you have beaten it.
This cheat will only work for a short time and will not save. You also must do this with Donkey Kong and not Diddy. First, you need to go to the first level. Turn around and climb up the stairs. Go into the hut and pick up the 1up balloon. Then, go out of the hut and jump onto the tree. If you climb on-top of the hut fist, bananas will come out. Otherwise, hit B-down to make him slap the ground. Ten bananas will come out. Hit B and then A when you get to the edge of the tree to make him roll and jump onto the next tree. You won't be able to make it if you don't. Keep hitting B-down when two trees are next to each other. Every tree won't have them. Pick up the balloons if you get to the next tree fast enough. Sometimes you will have to hit B and then A to get to the next tree. When you see a green balloon, it's a 2up balloon. If you get it, it signals the end. Jump off and start going left, collecting bananas and a [k]ong on the way. Watch out for baddies When you get to the beginning, go into the hole, but no farther. Walk out and everything will be reset. You can follow these instructions over and over again until you feel you have gained enough life. Then go to the end of the level.
At stop and go station go through the back of the starting place and you will find your self just a tiny bit away from the exit