Minecraft wiki entry for Things_to_do_when_bored, associated text: Similar to hardcore mode, this game mode only gives the player one life. However, this game mode also removes the ability to naturally regenerate health, meaning that golden apples and potions and even beacons have to be used to regenerate health. This is a game mode even harder than regular hardcore, which only the best players will be able to complete. So if you are new to the game I don't recommend this mode but if you are to play this watch your surroundings!