Unlock "It's War"
From the main menu select Options and then Cheats. Enter: 

BEELZEBUBSBUM 

You'll unlock the level "It's War" in Chapters.
 

Use Conker in War or Race Mode
Go to the options menu and enter the cheat code screen. Enter: 

WELLYTOP 

If you entered the code correctly the guy will say something like "Yeah, that's right". 
You will now be able to select Conker in the Total War mode or the Race mode.
submitted by nhood12
 

Use The Frying Pan in Race Multiplayer Mode
From the main menu select Options and then Cheats. Enter: 

DUTCHOVENS 

When you enter the Multiplayer mode and select Race you'll have the Frying Pan 
instead of your default weapon.
submitted by ape51088
 

Unlock Greg the Grim Reaper
From the main menu select Options and then Cheats. Enter: 

BILLYMILLROUNDABOUT 

You can now select the skeleton and Greg the Grim Reaper in Multi-player rounds.
 

Debug Mode
From the main menu you can select Options and then Cheats from here enter: 

XFYHIJERPWAL IELWZS 

(yes there is a space between the L and the I). The fire demon will acknowledge the code. 

Now this is where it gets a bit strange. After you've entered the code you can put your 
controller down. Lift ever so slightly on the left side of your cartridge (about 1/4 inch, maybe 
less) You'll see the jaw of the Fire Demon become all contorted then you'll see some numbers 
apear on the screen. As soon as you see the numbers you can push your cartridge back in to 
place. If you did it right you be taken to a menu. If you crashed your game you have to reboot
and start all over again. 

That's about it, once your at the menu you can access the Stack Numbers (that's cool and 
everything but does nothing for you). 9 out of 10 times I tried this the game crashed and then 
when I finally got it to work there was nothing for me to do when I got there. So you can try this 
trick but i will not benefit you in any way.
 

Extra Brutal Multiplayer
At the cheat menu you can enter: 

SPUNKJOCKEY 

When you enter Multi then you can enter any solo-multiplayer mode (in other words: play 
multiplayer by yourself) that has Katana swords and chainsaws. Grab the Katana sword or 
the chainsaw and attack your enemy. You'll see new death animation resembling the Matrix.
 

Unlock Spooky In Chapters Mode
From the main menu select Options and then Cheats. Enter: 

SPANIELSEARS 

You can now enter Chapters and select Spooky and play Mr. Death's level.
 

Unlock Caveman For Multiplayer
From the main menu select Options and then Cheats. Enter: 

EATBOX 

You can then select him in Multiplayer rounds.
 

Unlock Neo Conker
At the cheat menu enter: 

EASTEREGGSRUS 

Now enter Multi, when you can select your character you can choose NEO Conker.
 

Unlock Slopranos In Chapter Mode
From the main menu select Options and then Cheats. Enter: 

ANCHOVYBAY 

The Slopranos is now available in Chapters Mode.
 

Unlock The Baseball Bat In Race Mode
From the main menu select Options and then Cheats. Enter: 

DRACULASTEABAGS 

When you play the Race mode in Multiplayer you will have a Baseball Bat instead of a stick.
submitted by KevinKorrupt
 

Unlock Uga Buga in Chapters Mode
From the main menu select Options and then Cheats. Enter: 

MONKEYSCHIN 

You can now enter the Chapeters and select Uga Buga and play the Drunken Gits level.
 

Unlock Zombies and Villagers for Multiplayer
From the main menu select Options and then Cheats. Enter: 

BEEFCURTAINS 

Some of your multiplayer characters will now be Zombies or Villagers.
 

Unlock Barn Boys in Chapter Mode
From the main menu select Options and then Cheats. Enter: 

PRINCEALBERT 

Barn Boys can now be selected in Chapters Mode.
 

Unlock Bats Tower
From the main menu select Options and then Cheats. Enter: 

CLAMPIRATE 

You can now choose Bats Tower in Chapters Mode.
 

Unlimited Tails
When you get to the 2nd stage in Conker's Bad Fur day (the stage with the Queen Bee), you 
will see a hook on a sign. If you happen to die, Death will appear and teach you about those 
hooks. After you first "near death experience", the hooks will have tails on them that give you 
extra lives. But did you know that these tails actually respawn when you leave an area? So in 
this instance, to get unlimited lives simply grab the tail and leave the stage by going back to the 
first stage. Return to pick up your second tail -- and repeat as many times as you like.
submitted by Vegeta30
 

50 Lives
From the main menu select Options and then Cheats. Enter: 

BOVRILBULLETHOLE 

This will give you 50 lives in Single Player mode
submitted by KevinKorrupt
 

Banjo's Mounted Head
While your in the Cock and Plunker (aka. the main menu) take a look above the Fireplace. You'll 
notice Banjo's head mounted above the fireplace. Move your cursor until it says Options. Banjo's 
head is behind the OP in the word OPTIONS. As you move the cursor left and right you'll get a 
glimce of Banjo's head.
 

Easy Mode
From the main menu select Options and then Cheats. Enter: 

EASY 

The game will be easier.
 

Kazooie's Cameo
While you're in the Cock and Plunker select Chapters and behind the level descriptions you 
can see Kazooie.
 

Unlock Every Chapter and Cut-Scene
From the main menu select Options and then Cheats. Enter: 

WELDERSBENCH 

Every Chapter will be available.
 

Unlock Seargent, and Tediz Leader
From the main menu select Options and then Cheats. Enter: 

RUSTYSHERIFFSBADGE 

When you enter one of the multiplayer rounds you will be able to select Seargent or Tediz Leader
 

Unlock The Heist Level
Enter the Cheat menu and enter: 

CHOCOLATESTARFISH 

Now you can enter the Chapters and select the HEIST level.
 

Unlock Weasel For Multiplayer
From the main menu select Options and then Cheats. Enter: 

CHINDITVICTORY 

You'll unlock the Weasel Henchmen for Multiplayer. Enter one of the levels where you can 
select characters and they will be a couple of your choices.
 

Very Easy Mode
From the main menu select Options and then Cheats. Enter: 

VERYEASY 

Your game will be very easy now.