Here is a set of videos from happy thumbs gaming on youtube with guides to all Collectibles in every level plus a prep videos for what you will need to get em in one wack
*i take no credit for any of the videos listed all credit goes to happythumbsgaming*
PREP
LEVEL 1
LEVEL 2
LEVEL 3
LEVEL 4
LEVEL 5
LEVEL 6
LEVEL 7
LEVEL 8
LEVEL 9
LEVEL 10
LEVEL 11
LEVEL 12
LEVEL 13
LEVEL 14
LEVEL 15