I beat New Super Mario Bros. U the other day. But that’s just beating the end boss…I’m now going back to try collecting all of the star coins. In fact, I even bypassed an entire world. At one point early on, the game gives you a choice of which way to go, into the ice world or the water world. I chose the ice world then, so I just now got to experience the water world.
That includes this level, where an annoying sea dragon stalks you the entire time. I’m not a big fan of underwater levels.
This is what my file looks like now. I still have a lot of star coins (and levels) yet to go.