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The original version from 1995
Original 5x5 version. The aim is to switch off all the lights. Pressing a button changes the light in that button as well as the lights directly adjacent to it horizontally or vertically, switching each one off if it was on and vice versa. It has 50 built-in patterns to solve of increasing difficulty, as well as randomly generated patterns.
There exists a reissued version from 2002 which functions identically but has different styling.
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Thank you to the following people for their assistance in helping collect the information on this page: Joshua Bell.
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