Necky's Nuts

Necky's Nuts is the boss level of the Monkey Mines, the second world of the game Donkey Kong Country. The Kongs must beat the titular giant vulture Master Necky to progress to Vine Valley.

SNES
As with all world boss fights in Donkey Kong Country, the fight takes place in an arena filled with bananas, in this case within a single screen; and if the player enters with a single Kong, a DK Barrel is instantly broken to ensure they start the fight with both Donkey and Diddy. A single tyre is embedded in the centre of the arena.

In the battle, Master Necky's head emerges at a random height from either the left or right of the screen and spits a coconut at the Kongs. To defeat this enormous bird, Donkey or Diddy must use the bouncy tyre in the middle of the bird's banana lair to jump up to stomp Master Necky's head. After five hits, Master Necky collapses and Donkey Kong recovers a Giant Banana.

The player never gets to see Master Necky's whole body; only his head appears on the screen.

Game Boy Advance
In the Game Boy Advance remake, Master Necky is bright red before and after he attacks, becoming temporarily invincible. The Kongs can't damage him until he spits out a coconut, showing his normal color, but he turns red again as he leaves the screen.

Trivia

 * The level's title may be a referring to male genitalia; Rare was known for often putting innuendos in otherwise innocuous games.