Cheat Code Wishes:
Go to the Mayhem Temple near Wumba's Wigwam and enter any of the following "Codes". First enter 'CHEATO' followed by the code (like this: CHEATO JIGGYWIGGYSPECIAL): 
Cheat Code - Granted Wish 

JIGGYWIGGYSPECIAL - Level Select 
SREHTAEF - Double Feather Carrying Capacity 
SGGE - Double Egg Carrying Capacity 
NESTKING - Unlimited Eggs and Feathers 
KCABYENOH - Unlimited Air and Health 
SUPERBANJO - Banjo Moves Faster 
SUPERBADDY - Enemies Move Faster 
XOBEKUJ - Music Test Unlimited in Jolly Roger Bay 
HONEYBACK - Unlimited Health 
FOORPLLAF - No Damage When Falling 
YGGIJTEG - Jiggy Hints Given by Signs in Master Jiggywiggy's House 
PLAYITAGAINSON - All Replay Sub-Options Unlocked 
JIGGYSCASTLIST - View Ending Sequence 


The Secret Items/Eggs:
There are 3 special, secret N64 cartridges in Spiral Mountain and Jinjo Village. They each hold a "mystery" item from Banjo-Tooie, the Ice Key, Pink Egg and Blue egg. Here is how to locate them. 

For Cartridge 1 and the Blue Egg, use the fly pad at the tip of spiral monuntain to fly into the cave in the smaller of the 2 waterfalls. In the area there, there is a small ledge. Flip flap jump and grip grab the ledge, then follow it along into a tunnel. in the tunnel is the Game Pak with the Egg inside, roll into it to free the egg. 

For Cartridge 2 and the Pink Egg, use the fly pad and airborne aiming sight to launch a egg at the padlocked door directly opposite Gruntilda's old lair. In there is the Cartrige, roll into it to free the egg. These 2 eggs can be brought to Heggy's egg shed, located by following a path directly opposite Mayahem Temple's entrance in Wooded Hollow. Heggy hatches the 2 eggs and gives you a new move (Breegull Bash) and a code (homing Eggs). 

As for the third and final Cartridge with the Ice key, it is in Jinjo Village. There is a small ledge in the sandy area behind the green house. Grip grab the ledge and follow it to reach a cave with the cartridge. Smash it to reveal the Ice Key, which i am not completely sure what to do with.... 

Oh! and by the way..... once you have the Hatch move for Kazooie and the Split Up and bill Drill moves, go back to heggy's shed. If you didnt already notice, there is a ed piece of shell on the floor. Use the Bill Drill on it to reveal a Split up Pad. Split the pair, and use kazooie to hatch the yellow egg on the second floor of the egg shed. after doing this, the jinjo can be used in multiplayer battles. Enjoy these secrets. 

Banjo's Double Jump:
While playing with Banjo, without Kazooie in your backpack, jump then use the "Pack Whack" attack, then jump again. Banjo should now do a second jump. NOTE: You must have learned the "Pack Whack" attack, or this will not work.