The Game Boy line (Japanese: ???`????`?? G??mu B??i) is a line of battery-powered handheld game consoles sold by Nintendo. It is one of the world's best-selling game system line, selling over 120 million units worldwide as of 2006 and has spawned many successful spin-offs. It is also the best-selling portable game system line ever, and the longest runner.

History
Nintendo's Game Boy handheld was first released in 1989. The gaming device was the brainchild of long-time Nintendo employee Gunpei Yokoi, who was the person behind the Ultra Hand, an expanding arm toy created and produced by Nintendo in 1970, long before Nintendo would enter the video game market. Yokoi was also responsible for the Game & Watch series of handhelds when Nintendo made the move from toys to video games.

When Gunpei designed the original Game Boy, he knew that, to be successful, the system needed to be small, light, inexpensive, and durable, as well as have a varied, recognizable library of games upon its release. By following this simple mantra, the Game Boy line managed to gain a vast following despite technically superior alternatives.

Game Boy continues its success to this day and many at Nintendo have dedicated the handheld in Yokoi's memory. Game Boy celebrated its 15th anniversary in 2004, which nearly coincided with the 20-year anniversary to the original Nintendo Entertainment System (NES). To celebrate, Nintendo released the Classic NES Series and a NES-themed color scheme for the Game Boy Advance SP.

Nintendo president Satoru Iwata had this to say on the rumored demise of the Game Boy brand: "No, it's not true after all. What we are repeatedly saying is that for whichever platform, we are always conducting research and development for the new system, be it the Game Boy, or new console or whatever. And what we just told the reporter was that in thinking about the current situation where we are enjoying great sales with the DS and that we are now trying to launch the Wii, it's unthinkable for us to launch any new platform for the handheld system, including the new version of the GBA... Perhaps they misunderstood a part of this story, but as far as the handheld market is concerned [right now] we really want to focus on more sales of the DS; that's all."

Versions
The Game Boy console went through several design iterations, without significant changes to its computing power, since its release in 1989.

Game Boy
The original Game Boy was released on April 21, 1989 in Japan and in August 1989 in the United States with an MSRP of US$100. Based around a Z80 processor, it had a black and green reflective LCD screen, an eight-way directional pad, two action buttons, and Start and Select buttons. It played games from ROM-based media contained in small plastic detachable units called cartridges (sometimes abbreviated as carts or GamePaks).

The killer game that pushed the Game Boy into the upper reaches of success was Tetris. Tetris was widely popular, and on the handheld format could be played anywhere. It came packaged with the Game Boy, and broadened its reach; adults and kids alike were buying Game Boys in order to play Tetris. Releasing Tetris on the Game Boy was selected as #4 on GameSpy's 25 Smartest Moments in Gaming: Tetris Makes Game Boy a Must-Have.

The original Game Boy was the first cartridge-based system that supported more than four players at one time (via the link port). In fact, it has been shown that the system could support 16 simultaneous players at once. However, this feature was only supported in Faceball 2000.