by Leren » Fri May 08, 2020 8:43 pm
Hi Scarlet, that site had the original list of just over 7,000 twelve clue Sudoku X puzzles. Work by a number of others has increased that by quite a lot, and it's still work in progress.
I have a list of about 545,000 such puzzles but I don't have a web site. If you give me your email, either directly by reply or by the forum email system, and I'll send you my current list.
Leren