About Son of Doctor Esker's Notebook, from BoardGameGeek:
Doctor Esker has vanished, leaving behind only a mysterious book full of puzzles written in his own hand. Nobody has cracked his cryptic codes yet. Are you up to the challenge?
The game provides a deck of 74 cards which contain ten devious puzzles to solve. You can play through the puzzles solo or together with family and friends. Great for a party, a game night, or a lazy afternoon.
Each puzzle is composed of a set of cards. You can solve the puzzle by reading, comparing, arranging and pondering the messages, drawings, and artwork on the cards. Solving the puzzle reveals a sequence of numbers. When you think you've got it, gather the solution cards corresponding to the number sequence and flip them. If you see a message or image, you've solved the puzzle. Persevere to the end and receive Dr. Esker's greatest praise and a clue to his story.
Son of Doctor Esker's Notebook is the first sequel to Doctor Esker's Notebook. It is a stand-alone game. You do not need to have played Doctor Esker's Notebook to play this game, and you can play them in any order without any issues.
-description from designer
