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Richard

Richard is one of the most productive authors in the puzzle portal. His specialty are Sudoku variants and ABCtjes, but he also likes using Pentominoes in his puzzles. Richards puzzles are very popular: almost all of his puzzles are rated above 80%, and they cover the whole difficulty range. Enjoy Richard's puzzle creations!

DescriptionsolvedRating
newSudoku Variants Series (476) - Golden cells
by Richard (on 17. July 2026, 06:00)
1002
89 %
unsolvedSudoku Variants Series (475) - N-Sums - skyscrapers
by Richard (on 10. July 2026, 06:00)
603
98 %
unsolvedSudoku Variants Series (474) - First seen odd/even
by Richard (on 3. July 2026, 06:00)
873
95 %
unsolvedSudoku Variants Series (473) - Even X-Sums
by Richard (on 26. June 2026, 06:00)
972
96 %
unsolvedSudoku Variants Series (472) - Magic Japanese summer
by Richard (on 19. June 2026, 06:00)
1163
98 %
unsolvedSudoku Variants Series (471) - Lunchbox
by Richard (on 12. June 2026, 06:00)
923
95 %
unsolvedSudoku Variants Series (470) - Harmonious Thermos
by Richard (on 5. June 2026, 06:00)
1772
94 %
unsolvedSudoku Variants Series (469) - Stardust
by Richard (on 29. May 2026, 06:00)
892
93 %
unsolvedSudoku Variants Series (468) - Opparity arrows
by Richard (on 22. May 2026, 06:00)
1033
95 %
unsolvedSudoku Variants Series (467) - Second start skyscrapers
by Richard (on 15. May 2026, 06:00)
1102
97 %
unsolvedSudoku Variants Series (466) - Parity swap arrows
by Richard (on 8. May 2026, 06:00)
1982
96 %
unsolvedSudoku Variants Series (465) - Productive Killers
by Richard (on 1. May 2026, 06:00)
514
94 %
unsolvedSudoku Variants Series (464) - Greater than Killer
by Richard (on 24. April 2026, 06:00)
1372
97 %
unsolvedSudoku Variants Series (463) - Borderland
by Richard (on 17. April 2026, 06:00)
913
98 %
unsolvedSudoku Variants Series (462) - Hitlines
by Richard (on 10. April 2026, 06:00)
723
93 %
unsolvedSudoku Variants Series (461) - Dutch Arrows
by Richard (on 3. April 2026, 06:00)
1422
96 %
unsolvedEasy Peasy Sudoku Leftover (13) - Position Sums
by Richard (on 1. April 2026, 06:00)
653
95 %
unsolvedEasy Peasy Sudoku Leftover (12) - Cage Relations
by Richard (on 27. March 2026, 06:00)
792
97 %
unsolvedEasy Peasy Sudoku Leftover (11) - Killer Skyscrapers
by Richard (on 25. March 2026, 06:00)
753
91 %
unsolvedEasy Peasy Sudoku Leftover (10) - Little Palindromes
by Richard (on 20. March 2026, 06:00)
1042
95 %
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