|I could either continue Chapter 3 now or start Chapter 4: Alpine Skyline.|
Chapter 4's hub area is a few rooms... there's another relic stand you can find by using the Dweller's Mask, and getting to the world itself requires the hookshot badge.
This chapter doesn't seem to have any acts... just one level labeled "FREE ROAM - Do Whatever You'd Like"
Woah... this place is really epic looking... it feels like an outdoor Zelda dungeon.
This level is HUGE... it's divided into separate pieces of landmass separated by ziplines... Blowing on a horn opens up more ziplines between areas... The main central area has a bunch of these huge walking goat enemies.
I ended up going to the bird's nest area first... it's a really long, linear but confusing platforming section, with a lot of exploding egg enemies that require the use of the witch hat. there's also some optional tricky side paths that make use of the witch hat, the dweller's hat, etc... I think I got all of the yarn pieces and tokens available along this path.
Surprisingly, it doesn't boot me out of the level after collecting a time piece. Instead, it sends me back to the central goat island so I can continue exploring... then I noticed the purple time rift portal, and went into there.
That purple time rift in chapter 4 was pretty hard... took me a while to find all of the photos.
Now I'm very close to unlocking Chapter 5... there's still most of chapters 3 and 4 left to do, and still another act and a time rift in Mafia Town that I haven't done yet.