5. Dolphin Kick

Dolphin Kick ranks high on this list because it is the only thing that makes water levels tolerable. Nintendo, knowing people who play video games dislike swimming in slow-paced, underwater levels, still continues to put them in Mario games, but Dolphin Kick, which lets your characters propel themselves forward in the water, speeds up the terrible awful to a sensible pace. Is it elevated by getting you out of some of the worst parts of the game? Maybe! But it deserves its flowers for that.