Ключевые слова: activity, answer, black, blank, box, brain, challenge, clever, column, competition, complexity, concept, cross, crossword, crossword puzzle, difficult, empty, entertainment, fun, game, grid, health, hobby, intelligence, knowledge, leisure, letter, mental, mind, newspaper, number, page, paper, pattern, pen, pencil, person, puzzle, relaxation, skill, skin, solution, solve, square, vocabulary, white, wood, word, write, yellow,