I'm about to spoil a secret about mega maze, it's not worth running mega maze mash-up because there is a quicker way to level: Let's say you have 3x combo Blessing, thrasher and 2x weekly. That's 24xp a charecter. When it's that much xp you can be losing 300xp a run.

I suggest running: 2: Balefort Castle: Sad Little Knights
You go from 101 people to 37 in a very VERY short amount of time. I've tested with my friends... Although have not used to level up myself due to not being a rich kid ^_^