When you think about it, the last two generations of handheld gaming (chiefly Nintendo DS and starting with Game Boy Advance) got flooded with more casual gamers than any of its predecessors, like Game Boy and Game Boy Color.

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Nintendo introduced its first major revision to the Game Boy in 1998 with the Game Boy Color, which, not surprisingly, offered a color screen, case, and better graphics capabilities while still being backward compatible with the enormous library of Game Boy titles.

ENGADGET: A Brief History of Handheld Video Games

The Turbo Express was about the size of a Game Boy but had a sharp active-matrix color display and could even be used as a portable TV with an optional tuner.

ENGADGET: A Brief History of Handheld Video Games