(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Yin Yang Sum Frame Sudoku by flutchman (on 21. December 2025, 21:10) | 156 |  98 % |
| ZAUBERN - MAGIE - Buchstabenrätsel by DocLogic (on 13. February 2020, 22:25) | 39 | 91 % |
| Carpet Sudoku III: Cleopatra's Tryst by jackisaacbryan (on 26. September 2020, 22:49) | 24 | 98 % |
| Sudoku Variants Series (292) - Coordinates Sudoku by Richard (on 28. October 2020, 00:00) | 63 | 96 % |
| The c(l)over-up by Sktx (on 6. July 2021, 12:29) | 25 | 91 % |
| Doublophobia by lepton (on 7. January 2023, 08:38) | 21 | 97 % |
| Sick and Twisted Sandwiches by Andrewsarchus (on 10. January 2023, 04:15) | 17 | 98 % |
| Herding Cats by jsmirob (on 24. September 2023, 22:33) | 20 | 95 % |
| Another “One of These Things” by Jrosas (on 4. April 2024, 16:47) | 23 | 92 % |
| Moo's Final Boss by Laake (on 19. April 2025, 09:26) | 38 | 94 % |
| Infantapaulting Hypothesis (Slingshot Nurikabe) by sfushidahardy (on 17. August 2025, 01:47) | 44 | 100 % |
| Solo by Kaktuslav (on 23. November 2025, 10:00) | 33 | 98 % |
| Every 1 sees two 2s and three 3s by Lutterot (on 26. November 2025, 18:54) | 19 | 92 % |
| Sandwiched XV Squishmates by SennyK (on 30. December 2025, 23:19) | 26 | 93 % |
| Ubiquitous by NicoD (on 14. February 2026, 05:30) | 152 | 95 % |
| Ayeheya Galaxy by mathpesto (on 17. February 2026, 04:07) | 39 | 97 % |
| Yin Yang Arrows by Schwupel (on 23. September 2022, 19:36) | 137 | 99 % |
| Torn Apart by Black_Doom (on 18. August 2024, 11:58) | 71 | 96 % |
| Asterisk (palindrome killer sudoku x) by clover (on 23. November 2020, 16:01) | 90 | 94 % |
| X Gon' Give It To Ya by Justalilguy (on 7. February 2025, 17:11) | 45 | 96 % |
