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The hardest of three versions, depicting numbers 1-16.
At least this version with numbers was marketed in Britain (as "it") too.
There was also a medium version (see the seperate entry) and an easy version (very similar to Uriblock). All three came in at least two different designs. One named "Tsukuda's Square", the other "Four by Four".
If you're looking to buy, eBay is the one place you can find almost anything... if you're willing to wait for it, then pay the price!
Thank you to the following people for their assistance in helping collect the information on this page: Geert Hellings.
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