for many puzzles including Rubik's Clock Real Genius Computer game implementation of Rubik's Clock for the Commodore Amiga, released in 1989 https://www.worldcubeassociation.org/results/rankings/clock/average https://www.worldcubeassociation.org/results/rankings/clock/single?show=100+persons Mechanical puzzles Combination puzzles 1988 works 1988 introductions 1980s toys