Heads up: Spoilers for the first two Kingdom Hearts games, Birth by Sleep, and Dream Drop Distance ahead.
Flying a Gummi Ship (Kingdom Hearts 1/2)
Gummi Ships serve as the means of traveling between worlds in the Kingdom Hearts universe. In the first game, doing this for the first time was a huge thing, as it meant you could finally get out and explore Disney worlds. The sequel added onto this by improving the Gummi Ship mode in almost every single way, making it more action packed, faster paced, and adding an easier custom Gummi system that you could utilize by destroying certain ships.