beach buggy racing shortcuts fire and ice

If a late-game boss has multiple difficulty levels, expect the absolute highest level to be considered a superboss, if not the True Final Boss. More merciful boss rushes may instead exclude the game's superbosses just so that they won't single-handedly push the difficulty too far. Their usual habitat is the end of a Bonus Dungeon, Brutal Bonus Level, sidequest, or Boss Rush. The key features are that they are the hardest fights in the game, defeating one isn't necessary to complete the game, and they require quite a bit of conscious effort to find.

There's no real limit to the number of superbosses you can fight Final Fantasy X had dozens of them cordoned off in the optional (and highly incongruous) Monster Arena. Sometimes this is justified with an in-universe explanation, but more often than not, it's a glaring example of Giant Space Flea from Nowhere, which itself is a subtrope of Gameplay and Story Segregation. They typically aren't directly connected with the main plot of the game, even if their world-ending strength rivals that of the Final Boss.

Essentially, they are there to provide an extra challenge that is too difficult for the main game. The Superboss is a type of Optional Boss which serves to test players' mettle by being much harder than any other boss in the game. Marisa, Touhou Chireiden ~ Subterranean Animism, Extra Stage

Beach buggy racing shortcuts fire and ice