We publish a monthly Sudoku-k magazine for advanced and Sudoku-k intermediate difficulty. Logic progression hints, competition, solvers' discussion on the site. In each issue sudoku by difficulty, sudoku competition, subscription option, solvers discussion on the web.

Křížovkárna is a professional on-line service for creating crosswords, eight-question puzzles, sudoku and make-up puzzles. You can create puzzles with this app anytime and anywhere. The application offers users full control over the content (custom puzzles, expressions and appearance), including the possibility to export to print quality.

Interest group of crossword and puzzle solvers and creators organizes solving competitions and contests. We publish magazines with the theme of puzzles. Members of the association earn qualification points in competitions and can become holders of qualification classes (from third to master).

Publishing the Sphinx Crossword puzzle fortnightly and the semi-annual Sphinx magazine. The colourful magazines feature crosswords of all varieties including full-page ones, cartoon multi-puzzle puzzles and one-off and long-running competitions for cash and in-kind prizes.

We are involved in the creation of advertising crosswords, sudoku and kakuro. We offer and carry out commissions focused on the design and typesetting of advertising or product leaflets, logo designs, template designs for powerpoint presentations or templates for documents created for example in MS Word.

We offer a comprehensive service in supplying crosswords, eight-solvers and other puzzles, riddles and puzzles to newspapers, magazines and books. You can order individual crossword puzzles from us, as well as entire magazines and books of crosswords made to order. We produce crossword puzzles, octagrams for various periodicals.

I offer crossword puzzles and other puzzles. Puzzle making including graphic works.

Association of authors of crosswords, puzzles and brainteasers, production of crosswords for newspapers and magazines.

We invent and organize original adventure games and events. We prepare outdoor and indoor games, experiential missions and games via mobile app. Customized programs for companies, cities, schools and private parties.

We are involved in the creation and publishing of games, crossword puzzles and quizzes.

We organize escape games.