1 UP Heart

1 UP Hearts (alternatively 1-Up Hearts or 1UP hearts ) basically perform the same function as 1-Up Mushrooms, awarding one extra life to the player in Super Mario Land, Super Mario Land 2: 6 Golden Coins and Donkey Kong on the Game Boy. The most likely reason that 1 UP Hearts are used in these games rather than 1-Up Mushrooms is that the black-and-white palette of the original Game Boy would make it impossible to distinguish between 1-Up Mushrooms and Super Mushrooms.

Unlike most Mushrooms, in Super Mario Land, a 1 UP Heart will remain in one place until Mario grabs it. However, in Super Mario Land 2: 6 Golden Coins, the 1 UP Heart moves like the 1-Up Mushroom and slides away from Mario unless he can quickly catch it. Also in Super Mario Land 2, the 1 UP Hearts can be caught by a witch, who then runs away from Mario with them. In bonus games that occur if the Mario rings the bell placed hanging in the air at the end of a stage, 1 UP Hearts become available prizes; in the game with crane and conveyor belt, 1 UP Hearts with a "3" written on them make their appearance, and contain 3 UP.

In Donkey Kong on the Game Boy, 1 UP Hearts floats in mid-air at spots that are hard for Mario to reach without special moves. They reappear if the player lost a life and had to repeat the level.

1 UP Hearts appear in minigames in both Super Mario Land titles, and similar items appear in "Modern" versions of Game & Watch games in Game & Watch Gallery and its sequels. These Hearts replenish a life that was lost, and only appear when a player reaches 200, 500, and 700 points in most games; if a player does not have any Misses when they pass these points, a Heart does not appear. In this game, they are pink and have a two-toned color scheme similar to the one suggested by the white and gray pattern of the Super Mario Land 1 UP Hearts.