Ключевые слова: activity, black, blank, brain, break, challenge, closeup, competition, complexity, concentration, concept, cross, crossword, difficult, empty, enjoyment, exercise, fill, frustration, fun, game, grid, hand, hobby, intelligence, knowledge, leisure, letter, mental, mind, newspaper, paper, pastime, patience, pen, people, puzzle, relaxation, skill, smart, solution, solve, solving, spelling, square, time, vocabulary, word, write, yellow,