Ключевые слова: activity, answer, background, blank, brain, challenge, closeup, column, copy, cross, crossword, design, development, difficulty, drawing, education, educational, empty, entertainment, exercise, fun, game, hobby, idea, intellect, intelligence, iq, knowledge, learn, leisure, logic, mind, object, paper, pattern, pen, puzzle, quiz, recreation, riddle, solution, solving, space, square, template, text, think, thinking, word,