Side note, here are some MM2 levels

From Me:
V0N-LRR-2WF - Day 1 level, for the most part don't lose speed after the spring. (Results may vary)
CBM-HDY-R7G - Semi-Nintendo like level. 2 Paths, the bottom being a bit more interesting.
HLJ-NVJ-QMG - Semi-Nintendo like level. 2~ Blind jumps, end can be a bit annoying. Not every coin is required.

From a Friend:
X6W-JCS-GJF - First level, revolving around bom-omb jumping, pretty difficult. One part requires a bit of prior knowledge of when to jump. (just msg if you need help)
L19-MT5-F5G - Another bom-omb jumping, even harder.