This hurts my brain. :(

[-N-]

I noticed there wasn't any decent clues for LV36, 39, 45 (Jess sucks at math ).
Here you go.

LV36:
Use the brute force method if you suck at math. If you don't suck at math and spatial manipulation, you don't need this hint anyways.
Start by assigning dimensions and make a table of all possible non cubic dimensions. Examples are like 1 x 1 x 2, or 2 x 2 x 3. The spoiler contains the full solution. Highlight a line or two to see more examples.
LV36 Solution
L W H (length/width/height, I used yellow/green/height)
1 x 1 x 2 (18)
1 x 1 x 3 (9)
1 x 2 x 1 (18)
1 x 2 x 2 (12)
1 x 2 x 3 (6)
1 x 3 x 1 (9)
1 x 3 x 2 (6)
1 x 3 x 3 (3)

2 x 1 x 1 (18)
2 x 1 x 2 (12)
2 x 1 x 3 (6)
2 x 2 x 1 (12)
2 x 2 x 3 (4)
2 x 3 x 1 (6)
2 x 3 x 2 (4)
2 x 3 x 3 (2)

3 x 1 x 1 (9)
3 x 1 x 2 (6)
3 x 1 x 3 (3)
3 x 2 x 1 (6)
3 x 2 x 2 (4)
3 x 2 x 3 (2)
3 x 3 x 1 (3)
3 x 3 x 2 (2)

Total: 180

An easy clue for LV39 - LV39 hintit's easy if you're familiar with the Pulitzer Prize winning novel "Godel, Escher, Bach: An Eternal Golden Braid". (One of my favorite nonfiction books, so I got it right off the bat.)
Solution:The book was written by Douglas Richard Hofstadter. Philistine.

LV45: Your path from stepping up and down will cross over the same card more than once - in fact, this happens on two different cards. You will obtain a string of 0's and 1's - obviously binary. Search for a binary to decimal converter, convert it, and be on your way.
LV45 Solution660049