Merlin (also known as Merlin The Electronic Wizard, stylized as MERLIN) is a handheld electronic game first made by Parker Brothers in 1978.  The game was invented by former NASA employee Bob Doyle, his wife Holly, and brother-in-law Wendl Thomis.  Merlin is notable as one of the earliest and most popular handheld games, selling over 5 million units during its initial run, as well as one of the most long-lived, remaining popular throughout the 1980s. A version of the game was re-released in 2004 by the Milton Bradley Company.   Source: Wikipedia, Youtube