In Pirate Panic, go into K.Rool's cabin (don't collect the balloon) and then leave. Jump over the first two bananas, then collect the next bunch on top of the barrels. Still avoiding the first pair of bananas, return to the cabin and grab the balloon. Repeat step 2 then return to the cabin, still avoiding the first two bananas. You'll get a floating Kremcoin in the air. Grab it to automatically get all the Kremkoins.
Go to the ghost world in the 1st level climb up the 2nd rope and jump as high as posible. In a 1/15 chance Diddy should turn into a ghost.
In Hot Head Hop stand on a Crocidile head. Use Diddy and roll into the lava then jump up while holding "y" the whole time. You can land back on the crocidile head!
At the gameplay select screen highlight the Cheat Mode option and press Y, A, SELECT, A, DOWN, LEFT, A, DOWN.