Donkey Kong Country

Expert mode:
Get an 81% or higher completion by completing all levels (including bonus levlels) and getting all the coins at Candy's. Enter the options menu and turn off the DK barrels. This will allow you to increase your percentage by playing the game again at a harder difficulty.

Hidden sticker packs:
Hidden sticker packs are found under, near, or around green banana bunches. To obtain these hidden treasures, find a green banana bunch, and use Donkey Kong to slam the ground (hold Down and press B). You should see a tiny rectangle bouncing on the ground. Collect it and then turn off the game. Turn the game back on, select the "Print" option at the main menu, then go to "Sticker Book". You should find a small picture on one of the pages. Press A on one to print it. Note: This requires a Game Boy Printer connected to the Game Boy Color via a link cable.
Information in this section was contributed by MikeRoChip31.

Hint: Gorilla Glacier: Extra lives:
Go to Candy's Challenge in Gorilla Glacier. Spell "Candy" and you will get one life, then spell "Funky" to get two lives -- but do not correctly spell "Cranky". You can do this a many times as needed, but if you correctly spell "Cranky" you will not be able to go back.
Information in this section was contributed by Robert Cochrum.

Hint: Gorilla Glacier: Secret transporter:
Enter the Slipslide ride. When in the level, walk along until you find a kind of pointy object or a rope. Wait for the creature to appear and jump on it to get the height needed to grab the rope. When on the rope jump off to find a barrel. Throw it against the wall and go inside. Spell "Kong" and get an extra life. When finished are outside the cave, jump to find a secret transporter which transports you half way through the level.
Information in this section was contributed by dragon_boy12312341.

Hint: Jungle Hijinxs: Extra lives:
Go to the first stage in Kongo Jungle and enter Jungle Hijinks. Once you see Donkey Kong pop out, go back into his house. Jump on the rocks that are sticking out to get to the top. Enter the house to find a extra life balloon. Press Start to pause game play, then press Select to return to Kongo Jungle. Enter Jungle Hijinx again and repeat.
Information in this section was contributed by a.l.deleon and MonkyMan24.

Go to Jungle Hijinxs, climb the steps where the Donkey Kong's tree house is located, get on the trees, pass the arrow of bananas, pass the bunch of bananas, and get the red balloon. Keep going and do the very long jump to get another red balloon. Go a little farther and there will be a green balloon. Go all the way back to the start and find the hole. Go inside it to get Kong's Banana Board. Go back outside and you can get all the balloons again.
Information in this section was contributed by MoOnSnAiL9 and Pat2005.

Hint: Jungle Hijinxs: More golden ostriches:
Get the golden ostrich, then become the rhino. Open the bonus game, then press Select to leave rhino mode. Go back and pickup another ostrich.
Information in this section was contributed by CSershon.

Hint: Jungle Hijinxs: Camouflaged banana bunch:
Go to the exit sign at the end and turn around. Go down the little path next to the hill that you jumped off from. Go to the end of it and you should see a green banana bunch.
Information in this section was contributed by kmvance.

Hint: Kongo Jungle: Extra lives:
When you first appear, jump on the rocks and hop on the trees. You will find two red balloons and a green one.
Information in this section was contributed by DARKMAGICAN2K2.

Hint: Kremkroo Industries: Extra lives:
Jump on the first rope you see, wait until that rope stops, and jump off it. You will land on a TNT barrel. Pick it up and carry it over to the first oil can that you see. Throw the TNT barrel on the oil can and jump in the hole that was created. Shoot up from the barrel (a bonus level) to get an extra life. Press Start, Select to repeat as needed.
Information in this section was contributed by raynsue.

Hint: Kremkroo Industries: Secret room:
In Oil Drum Alley, after the three moles jump on to the metal plate to get a TNT barrel. Pick the barrel up, turn around, and walk into the wall to enter a secret room. Jump to get the single banana. Once you have collected three, a barrel will drop and take you into the next room where you need to spell "DONKEY" (red balloon) "KONG" (green balloon) COUNTRY (blue balloon). Once back in the game pause, then press Select to get back to the track.
Information in this section was contributed by Amo.

Hint: Millstone Mayhem: Bananas and letter:
Go on the tire at the start of the level and jump back. Jump into the barrel where to shoot up. You will find bananas, a DK barrel, and the first "K" of "Kong".
Information in this section was contributed by nfgrockergol.

Hint: Misty Mine: Extra lives:
Get to the section on Misty Mine where all the snakes appear from barrels in the floor. Jump on eight of them to get an extra life.
Information in this section was contributed by harryp37.

Hint: Oil Drum Alley: Break barrels:
Jump down the first hole you see after the checkpoint to land on a Rhino boost. You can now break the barrels that are rolling at you.
Information in this section was contributed by goof man.

Hint: Stop And Go Station: Shortcut:
Go to the left at the beginning of the level to fall half-way ahead in the level.
Information in this section was contributed by BrianMeiggs40.