Puzzler inventor Nob Yoshigahara, one of the world's formost puzzle designers, first imagined his Rush Hour traffic puzzle in the late 1970s. It sold first in the United States in 1996. To date, it is Think Fun Inc.'s (formerly Binary Arts) most popular seller, and it is now available in several thematic editions as well as in a deluxe version. Essentially a slider-type mechanical puzzle, Rush Hour helps develop problem-solving and spacial abilities. Online reviews call the game fun for the whole family, and lasting entertainment.