areas. Mega Man series: The Rush power-ups, which allow the player to attain power-ups not possible by any other means. The most common are Rush Jet, Rush Coil, Rush Marine, and Rush Search. Also notable are some of the capsule upgrades in the X spin-off series. Metroid series: Various weapons (such as the Ice Beam and the Power Bomb) are permanent power-ups that not only give Samus Aran additional offensive capability but also allow her access to various doors. Health and life reserves Health-restorative power-ups typically consist of items which restore lost health (most typically in medical kits, food, or as energy), items which increase health capacity and 1-ups (which give an extra chance to continue playing after losing, commonly called a 'life'). Examples: Mario: The Super Mushrooms and 1-up Mushrooms give Mario the ability to take an extra hit and extra lives (respectively). Wonder Boy: Fruits recharge the continuously dwindling player energy. Doom: First aid kits restore part of the player's health. Legend of Zelda: The heart containers permanently increase the player's total health capacity, while heart power ups each refill one heart container worth of lost health. Jak and Daxter: Green Eco, the most common type of Eco in the game, restores Jak's health. Clash of Clans: The Healing Spell causes all friendly troops (ground or air) to regain some health depending on the level each pulse (for forty pulses) in 12 seconds. Sonic the Hedgehog: The Extra Life box, represented in earlier games with an icon of the character the player is controlling, and in later titles by an icon reading "1-up", grants an extra life whenever it's collected. Ammunition and power reserves In some games, using certain items or abilities requires the expenditure of a resource such as ammunition, fuel or magic points. Some games use a single resource, such as magic points, while others use multiple resources, such as several types of ammunition. Some games also have power ups which increase the player's maximum ammunition or power capacity. Examples: Half-Life: Ammunition for guns. The Legend of Zelda: Ocarina of Time: Obtaining "Magic Jars" restores magic points, which are expended by many items and other special abilities. Descent 2: Energy power-ups restore energy, which is required to fire most primary weapons, and to use some other equipment such as the headlight and afterburner. Mega Man: While the default weapon has an unlimited number of shots, the