You are holding a book with the most intricate puzzles that, we dare to hope, will deprive you, if not sleep, then, in any case, peace. (We do not recommend bringing the matter to insomnia: it is better to look into the answers.) You have to measure the power of intelligence with the great Zamboni, find the mistake made by O Henry, master a couple of tricks with which you will surprise loved ones and friends more than once, or even earn pocket money, puzzle over time-tested tasks, but most importantly (and we have no doubt about that) - you will have a great time.