The Master Theorem: Elite - A Book of Puzzles, Intrigue, and Wit

You solved all of M's mind-bending puzzles in book one and earned your way into the ranks of The Master Theorem. Now it's time to level up.
"The Master Theorem: Elite" is M's devilishly difficult second installment, packed with 40+ all new Theorems, 5 additional "training" Theorems, and of course, hints and solutions in back.
Dubbed "Mensa's evil twin" by The New York Times, The Master Theorem originated in 2011 as an online "secret society of solvers" and quickly developed a cult following. Its larger-than-life figurehead is the cryptic polymath known only as M who challenges aspiring minds to solve all of his puzzles, called Theorems, in order to earn their way into The Master Theorem.
But M's Theorems are not your average Sudoku or crossword puzzles. They're each completely unique, beautifully illustrated, "escape room"-like puzzles that’ll have you decrypting messages and tackling creative brain-teasers. As with M's first book, solvers will enjoy weeks to months of neuron-growing entertainment as they work their way through M's perplexing puzzles and become Elite code-breakers.