The Nintendo Virtual Boy was a mostly-portable (easily moved) game console which had two screens that showed only red and black graphics. To use the system, one had to put one's face close to the system so that each eye could see only one screen. By showing each eye a different image, the system could create a 3D effect.
The way the system displayed images was not by LCDs, as some would think. At the time, LCDs could not be used because they had two problems when they were first tested on the console: they would blur if anything moved on the screen, and users would see double instead of depth. Instead, a vertical line of 224 very bright, but very small, LEDs were used for each eye. These LEDs flashed on and off very fast in certain patterns. This line of LEDs was then magnified by a lens, and a vibrating mirror would reflect each line at a certain time into each eye, creating a full image due to the human eye's persistence of vision. Unfortunately, due to the quick flashing of the LEDs, many users felt sick, became dizzy, or had headaches after playing for a long time. To help this, an "automatic pause" feature was added, which stopped the game play every 30 minutes for the player to rest his or her eyes.
The Virtual Boy was first sold in 1995, but was not popular. Consumers did not like the console's high price, monochrome graphics, eye and neck strain, and need for a stand. Many were saving money for the soon-to-be-sold Nintendo 64. Nintendo lowered the price many times, but the system did not sell well and was discontinued (Nintendo stopped making them) in 1996. Only 22 games were released in Japan and North America.
Popular games for the system include Mario Tennis and Virtual Boy Wario Land (Known as Wario Cruise in Japan).
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Nintendo Virtual Boy Facts for Kids. Kiddle Encyclopedia.