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Banjo Kazooie

Secret Puzzle Game - Stand on the green rug inside Banjo's house and look up at the picture of Bottles. You will then be in the secret jigsaw game

Carry 200 Blue Eggs - In Treasure Trove Cove, go to the word tiles under the Sand Castle and enter BLUEEGGS. Now you are able to carry 200 blue eggs at once!

Blast Corps

Instant Explosions - Stop the vehicle next to the building you want to blow up, so the driver can't get out and press the Z-trigger. The driver will shout, but if you hold Z the building will blow up. (This doesn't work on the bonus stages!)

Bomberman 64

Extra Battle Arenas - On the selection screen press the start button repeatedly until you hear a chime. You will now have access to Gutter, Sea Sick, Blizzard Battle and Lost At Sea.