A Launch Star is a major item in both Super Mario Galaxy and Super Mario Galaxy 2. Launch Stars are large (usually orange) stars that hover just above the ground of a planet, though occasionally they can also appear floating in the air above a planet, or just floating in space.
Super Mario series
Super Mario Galaxy
In Super Mario Galaxy, the first time Mario uses a Launch Star, the path of the Launch Star will originally be invisible, but will be traced out in space as Mario is flying to the next planet. However, if Mario later returns to a Launch Star that he has already used to travel to another planet, the path will be visible before he uses it.
They can only be activated by shaking the Wii Remote and causing Mario to spin when he is either in or next to a Launch Star, though any Launch Stars in the level will visibly spin when the Wii Remote is shaken, regardless of whether or not he is necessarily close to one. When activated, a Launch Star will catapult Mario to another planet or planets. When Mario stands directly under a Launch Star, the gravity of the Launch Star will pull Mario into the center of it automatically. If the player does not shake the Wii Remote after a few seconds, the Launch Star will release Mario and he will touch down on the ground again.
Launch Stars are not always readily available for Mario to use. In some cases, Mario must complete a certain task or objective before the Launch Star will appear, such as collecting five yellow Star Chips, eliminating all the enemies on a particular planet, or freeing a yellow Luma or the Launch Star itself from an Item Crystal or a cage. In addition, yellow Lumas are also able to transform into Launch Stars independently, though this is more common in Super Mario Galaxy 2 (the player will usually have to free the Luma from a cage before they will transform into a Launch Star, though this is not always the case). It is revealed in this game that these Lumas still retain the ability to talk to Mario while in Launch Star form.
Launch Stars often let Mario fly through space for a short time before landing on another planet, unlike their smaller sister items, Sling Stars, which often fling Mario directly to another planet, with very little space in between. While flying through space, Mario will occasionally hit a floating Star Crystal that has been placed directly in the path of the Launch Star, which will often release multiple Star Bits that will float around Mario until he lands on the planet. Mario can collect these Star Bits by touching them with the Star Cursor.
After Mario feeds a Hungry Luma, it will transform into a new planet or galaxy and leave behind a pink Launch Star leading to that planet. The only Hungry Luma that will not leave behind a Launch Star after being fed is the one that transforms into the Hurry-Scurry Planet in the Sea Slide Galaxy (Mario must use a cannon to reach the planet instead). There is also a green Launch Star located onboard the Comet Observatory that will take Mario to the Planet of Trials when activated. This one, as well as the Launch Stars on the Planet of Trials, are the only green Launch Stars in the entire game.
Though usually immovable, a Launch Star always stays (or appears after collecting 5 Star Chips) on its permanent location. However, one Launch Star can actually be moved upwards and downwards with regardless where it sends the player to. In the mission "Sunbaked Sand Castle" in Dusty Dune Galaxy, the player must go to the second planet and collect 5 Star Chips to make the Launch Star appear on top of the tower. Since the player can make the tower rise or sink by pressing a Ground-Pound Switch, the Launch Star can also rise or sink along with the tower, but it does not sink in the sand.
Super Mario Galaxy 2
Launch Stars reappear in Super Mario Galaxy 2, and serve the same function as in Super Mario Galaxy. In this game, the path of each Launch Star that Mario uses appears before he uses it for the first time, as well as each time he uses it following the first time. One exception to this is in the Grandmaster Galaxy, where no path is projected.
Mario Kart series
Mario Kart Wii
In Mario Kart Wii, a single large Launch Star appears in Rainbow Road, where it acts as a cannon and shoots racers into a rainbow tunnel and through another large Launch Star at the end (the second Launch Star does not launch racers however). The design of the railings of this course also has multiple Launch Stars on it.
Mario Kart 7
Launch Stars also appear on the Rainbow Road course in Mario Kart 7, with the look they have in Mario Kart Wii. Several of them appear in the last section of the course. If racers are able to use the glider, they can fly into these Launch Stars to get a speed boost and continue gliding through the next ones. If the player touches one when they're not gliding, they can still get a small speed boost.
Mario Kart 8
Launch Stars appear again in Mario Kart 8 with a different appearance.
In N64 Rainbow Road, while they were absent along with boost panels, glide panels, and antigravity panels in the course's original appearance, they appear on boost panels and in the air where racers can glide through them to get a speed boost. They are white with a slight color changing hue and a gold frame encompasses them. On the race track, the rails are designed of Launch Stars, instead of, in the original appearance, regular forms of stars.
In Rainbow Road, their design is similar to the ones in Mario Kart Wii, but now in a mechanical style. They rotate slowly, but unlike the Super Mario Galaxy series, Mario Kart Wii, and Mario Kart 7, they do not spin faster when they launch racers to another section. Every outer tips of the stars have pink light while the inner tip of them has blue light. Each launch stars' ring has two stars, with one that is placed on the front and the other on the back. The ring have rainbow lights that beam out to one another, which forms a vague boost tunnel like the ones from Mario Kart: Double Dash!! and Mario Kart Wii.
Mario Tennis Open
Launch Stars make an appearance in the Special Minigame Galaxy Rally in Mario Tennis Open. When the player completes the meter by collecting Star Chips, then the Launch Star is completed. For every consecutive hit by the ball, the Launch Star gives the player five more coins. The Launch Star's meter depletes after a certain amount of time. Once the meter reaches zero, the Launch Star disappears, and Star Chips reappear.
Super Smash Bros. for Nintendo 3DS / Wii U
The Launch Star makes the appearance of Rosalina's up special move in Super Smash Bros. for Nintendo 3DS / Wii U. When Rosalina uses this move, she is launched up into the air, much like the player is when a Launch Star is used in Super Mario Galaxy and Super Mario Galaxy 2. The Launch Star is now multicolored instead of one single color, and the small orbs at the ends of the Launch Star's five points appear to have been removed, but it otherwise seems to retain its appearance from the Super Mario Galaxy games. Both of Rosalina's custom up special moves are also Launch Star based.
The angle of the default Launch Star can be altered by tilting the Control Stick or Circle Pad, but it doesn't deal any damage; Launch Star Plus fires Rosalina at a much faster rate, but the player can't control its angle; Launch Star Attack sacrifices travel distance to allow Rosalina to damage opponents with her body, but the move will halt her momentum upon ending, and it can't travel straight up.
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