The Heart Boost is an item in Donkey Kong Country Returns. It is a type of Heart, only having a plus sign and a wooden outer cover. It is sold and can be purchased at Cranky Kong's Shop for ten Banana Coins. When Donkey Kong, or alternatively in two-player mode, Diddy Kong, uses a Heart Boost before entering a level, his maximum health increases from two Hearts to three Hearts for the duration of the entire stage, even if the player loses a life! When Diddy Kong is on Donkey Kong's back, the duo will have a total of five Hearts. However, if they are to use Squawks the Parrot or Banana Juice, the effect will wear off, should the Kongs either finish the level or quit prematurely.