|First appearance||Donkey Kong 64 (1999)|
- “If I disobey that fat old fool K. Rool, it's the big sawmill in the sky for me, so pay up pronto and I can get my wooden butt outta here.”
- —B. Locker, Donkey Kong 64
B. Locker is first encountered by Donkey Kong in the Jungle Japes lobby, where B. Locker reveals that he is unhappily working for King K. Rool, or else he would be punished (by "the big sawmill in the sky").
B. Locker is a wooden signpost with a pair of eyes, a nose, dark brown eyelids, a mouth, and two light brown arms with two red hands. B. Locker is attached to the ground by a small, metal pole. He usually crosses his arms. A picture of bananas are attached to his forehead.
B. Locker's mouth has three bottom teeth, and each tooth displays a number. The numbers displayed on his teeth represent the minimum number of Golden Bananas that the Kongs need to access a level.
A different number of Golden Bananas are required per each level. The later levels have a higher requirement than the earlier ones. If the Kongs have enough Golden Bananas, they can approach B. Locker, who then spins around and permanently leaves the lobby.
If the player presses Up, Down, Left, and then Right on the D-pad in front of B. Locker, the homing weapon sound is played indicating that the cheat code has been entered. If the player then approaches B. Locker with the correct Kong, B. Locker will let them through with a lower number of required Golden Bananas. The minimum default number, the lower amount and the corresponding Kong of the level are displayed in the following table:
|World||Minimum number||Corresponding Kong||Lower amount|
|Angry Aztec||5||Diddy Kong||3|
|Frantic Factory||15||Tiny Kong||10|
|Gloomy Galleon||30||Lanky Kong||20|
|Fungi Forest||50||Chunky Kong||35|
|Crystal Caves||65||Donkey Kong||50|
|Creepy Castle||80||Lanky Kong||65|
|Hideout Helm||100||Chunky Kong||80|
- "Come on. I haven't got all day! Show me the bananas and I'm outta this dump." When the player has enough Golden Bananas.
- "Oh. Go on then [Kong]. Seeing as you've got more than [N] Golden Bananas." When the player uses the cheat code.
- "Are you stupid or something? Read my teeth and go get some more, you furry fool." When the player doesn't have enough Golden Bananas.
- There is a glitch which allows Lanky Kong to pass through B. Locker without having the proper amount of Golden Bananas. Donkey Kong can also do this with his standard attack, and Chunky Kong can do it using the Primate Punch.