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