Hlavolamikon

Hlavolamikon is an extensive collection of puzzles, riddles, ciphers, and logic problems by Radek Pelánek. The title combines the Czech words for puzzle and lexicon, accurately reflecting the book's concept: it gathers hundreds of challenges of different types and difficulty levels in one place. Readers will find mazes, logic and number problems, geometric puzzles, ciphers, and language and knowledge-based tasks. The publication is suitable for individual solving, shared activities, teaching, and experiential or cipher games.

Radek Pelánek compiled Hlavolamikon as a varied source of challenges for leisure, education, and group activities. The book contains hundreds of tasks and works with several types of problems: mazes, moves and procedures, numerical logic problems, geometric puzzles, ciphers, and language or knowledge-based tasks. Each task's difficulty is marked with one to five stars, making it easier to choose according to the solver's experience. The author also emphasizes collective use in teaching, camps, family outings, and experiential and cipher games. Solutions appear at the end of the book. In compiling it, Pelánek drew on his many years of experience using puzzles in teaching, research, and experiential activities.

The difficulty levels allow tasks to be adapted to participants' experience when working with a group. Different problem types alternate between spatial, numerical, and language-based work. The solutions at the end encourage readers to revisit their methods and compare their reasoning with the result.

Book themes
Logical thinking: Many tasks require systematic reasoning, identifying relationships, and deduction.
Ciphers: The book includes tasks based on codes, ciphers, and discovering a hidden principle.
Geometric puzzles: Some tasks work with shapes, space, and geometric relationships.
Language and knowledge-based tasks: The collection extends beyond mathematics to include language and general-knowledge challenges.
Learning through play: The tasks can be used in teaching, group activities, or leisure time.

Who the book is for
Puzzle and logic enthusiasts, teachers, parents, children's group leaders, and organizers of cipher or experiential games.

Edition context
A practical puzzle collection by Czech author and university educator Radek Pelánek, published by Computer Press in 2014.