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Shuttle Loop is a move originally used by Wing Kirby in Kirby Super Star that has been incorporated into Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U as Meta Knight's up special move. Meta Knight leaps up into the air, slashing once, and loops around before flying up higher. In Super Smash Bros. Brawl, this move automatically enters into Meta Knight's glide, while in Super Smash Bros. for Nintendo 3DS / Wii U the move ends with Meta Knight dealing a second attack, and then entering a helpless state.
In Super Smash Bros. for Nintendo 3DS / Wii U, this move has two custom variants:
Blade Coaster enables Meta Knight to travel forward instead of up, enabling him to cover more distance horizontally, but it offers less vertical distance, and takes a bit longer to start up. Opponents who are hit by this attack are sent flying at a lower angle.
Lazy Shuttle Loop has Meta Knight performing a slower loop before striking with a single attack. It offers more vertical distance than Shuttle Loop. However, it also removes the initial hit that Meta Knight performs before starting the attack, which makes it less effective at making KOs.