Originally posted by Trakehner:

I'm imagining the lists will vary for people. A lot of it depends on luck of the seed. For me...

EASY:
- wood
- stone
- resin, guck, tar
- leather scraps
- core wood
- fine wood
- trophies (other than the stone golem)
- iron, dark metal, tin
- farmed foods

HARD :
- silver, copper
- freeze glands (#1)

Wood, stone and copper are basically infinite, it's just the time and effort to gather that's a thing. Silver takes more effort because of the biome its in, but I didn't find it tough to get all I wanted or needed.

I don't find much guck, but you don't need much. The drakes come in an endless supply, but they're easy to kill, and one drop per mob, and nothing else, makes them tedious and predictable.