Heart Boost

A Heart Boost is an item that appears in Donkey Kong Country Returns. It can be purchased from Cranky Kong for ten Banana Coins. When Donkey Kong, or alternatively in two-player mode, Diddy Kong, equips a Heart Boost before entering a level, his maximum health will increase from two hearts to three for the duration of the entire stage, even if the player should lose any lives. When Diddy Kong is on Donkey's back, the duo will have a grand total of five hearts.

However, as with using Squawks the Parrot or Banana Juice, the effect will wear off should the Kongs either finish the level, or quit prematurely.