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Sonic Underground is an LCD game created by Tiger Electronics in 2000. The game case was shaped like Sonic holding a guitar, an instrument he uses in the television show Sonic Underground. This is one of the few Sonic games to be based off a television series. The background of the game seems to be from one of the Sonic television shows, most likely Sonic Underground.
The game features a standard directional pad and 2 buttons "Spin Dash" and "jump". There is also a large switch on the center which will cause a ball to spin around the edge of the game case and cause the character to speed up. The objective of the game is to earn points by destroying SWATbots and avoid opponents like Sleet and Dingo.
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Digital manual from Tiger Electronics website