Below posts are originally posted in d.tube but somehow it doesn't synch to my hive account.
World 2 is definitely more challenging and even more obstacle. I think previously, I have never played this stage before since I always uses the flute and warp level from world 1 to jump straight to world 4, and oftenly I will also use the 2nd flute to warp to world 7 and quickly finish the game. It's a good thing we can now finally explore!