Stage 2 has a puzzle in the second half that requires flipping switches and disappearing blocks to make a path to jump across to get the Key Mold.

If you haven't started yet you can flip the 1st, 2nd, and 5th switch.

If you've flipped a bunch of switches and have now become thoroughly confused then simply make the switches go to the right or left in this pattern:

R R L L R L L


Have fun with the rest of the game.