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.

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

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).