I completed this game a long time ago on Wii U, but I forget how to find the secret level cube in this specific level (the one where the weather switches between hot and cold). Any help on where to find it would be greatly appreciated. Thanks!

In world 1-2, right after getting the green key and entering the next area (pink portal). I smash free the blue guys and my controller/keyboard stops working. The game freezes but not, because the animation of the blue guys twirling around is still going on and there are background noise. I just can't do anything. I've restarted the game and replayed the world. It stops at the same place both times....

How do you unlock 6-2? Also I am missing one upgrade from the shop but don't know how to get it (not the black square)

So, I beat every level in the game, gold ranking them even, but I don't know how to unlock the final level in world 6. Anyone have any tips? If I find it, I'll let you know.

I can't get past 10/40 blue guys. I see that there are several part where I can get stuff but they are blocked. Any help ?