Here's how many times people have looked at hints:

Doctor Esker's Notebook


Hint
Small #114715844524
Small #210812684323
Small #311515653323
Medium #18513693322
Medium #24613693422
Medium #33612452233
Large #1348352223
Large #2237432214
Large #3437444213


Son of Doctor Esker's Notebook (The Sequel)


Hint
Small #1102753123
Small #262555223
Small #342456123
Medium #142352114
Medium #232444114
Medium #341442114
Large #161834123
Large #241754133
Large #361843232


Return of Doctor Esker's Notebook (The Other Sequel)


Hint
Small #115441103300
Small #210431103300
Small #39551103300
Medium #18540104400
Medium #29510112400
Medium #39410101301
Large #19210101311
Large #29210100200
Large #37110100300

The hints are sorted by how much help they give you.
The last Large Hint on each page comes very close to just giving you the solution.