Theorysonic Blue King

, simply known as the Blue King, is a 8-bit fouth generation handheld game console developed and released by Theorysonic. Released in the Vlokozu Union in March 4, 1988 and on North America, Japan and Europe later that year, it was Theorysonic's first handheld game console. It featured the dot matrix screen, five control buttons, a speaker with volume control and uses cartridges as physical media for games. It was later succeeded by the Blue King Color in 1994.