History
The Square One, with the full name "Back to Square One", and alternative name "Cube 21", was invented by Karel Hršel and Vojtěch Kopský around 1990. Application for Czechoslovak patent was filed on 8 November 1990, the patent was approved on 26 October 1992 with patent number CS 277266 B6. On March 16, 1993, it was patented in the USA with patent number US5,193,809. Its design was also patented on October 5, 1993, with patent number D340,093.
Read more about this topic: Square One (puzzle)
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