I beat the game, unlocked the secret or remix world whatever it is beat all those and finally got 3 star coins in every level. Is there anything else to do or unlock in the game? I noticed it makes a note of which levels you completed with which brother - if I do them all with both is that something?
I got the game free too and really enjoyed it. There were certain parts, specifically jumps that I thought STILL were unfair because of the 3D (not the 3DS 3D, but that it is a 3D platformer and not 2D), some times I just couldn't tell if I was landing on a platform or not, regardless of the shadow. And there were times I had problems where I thought I was against a wall, jumped and seemed to not be against the wall. These moments were few thankfully, but frustrating. I also thought the secret world got very challenging towards the end, overall I really liked it, probably more than any other Mario game I've played recently (including original NSMB and both Galaxy games).