Ключевые слова: background, brain, classic, colorful, colors, cube, dice, difficult, editorial, effort, entertainment, erno, funny, game, green, hand, illustrative, isolated, item, logic, mathematical, mind, multicolor, old, play, problem, puzzle, puzzling, random, rebus, red, rubik, rubiks, six, solved, solving, square, teaser, think, toy, white,