Ключевые слова: abstract, achievement, activity, adversity, art, background, border, brain, brainteaser, business, challenge, challenging, choice, color, complex, concept, conundrum, design, destination, education, entrance, exit, find, flat, game, idea, illustration, image, intricacy, isolated, kids, labyrinth, line, logic, maze, play, puzzle, quadrate, quest, school, search, shape, square, target, training, unique, useful, wall, way,