(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 | |
|---|---|---|---|
 | Odd Blockade Runners 2 by JeffWajes (on 1. May 2023, 19:18) | 37 |  95 % |
| Cold Sauerkraut (Nabner Thermo Sudoku) by Silverstep (on 24. August 2023, 17:47) | 30 | 91 % |
| Everything is Wrogn by Sumanta(ANU) (on 30. August 2023, 06:23) | 34 | 93 % |
| A Christmas Vacation Around the World (CTC Secret Santa 2023) by Niverio (on 27. December 2023, 15:11) | 33 | 91 % |
| CountDoku by AFrayedKnot (on 21. June 2024, 02:09) | 29 | 92 % |
| SET 103: palindromes and arrows by NicoD (on 17. August 2025, 05:30) | 66 | 96 % |
| (Yin)German Pairrows by SennyK (on 6. January 2026, 20:10) | 31 | 91 % |
| XX Sandwich by Tomatenalat (on 15. September 2024, 11:46) | 106 | 96 % |
| Sudoku Variants Series (318) - Thermometers - Removed Bulbs by Richard (on 28. April 2021, 00:00) | 70 | 95 % |
| Iso by ICHTUES (on 19. December 2021, 06:00) | 70 | 95 % |
| Criminally Liable by oskode (on 10. April 2025, 11:22) | 81 | 94 % |
| Zodiac Project: Cage Decoder by sujoyku (on 12. June 2024, 23:06) | 112 | 95 % |
| Adventskalender-ABCtje by StefanSch (on 30. November 2012, 00:00) | 34 | 91 % |
| Negativity by jwsinclair (on 31. January 2022, 22:13) | 37 | 96 % |
| Quad van de Wetering by PotatoHead21 (on 31. March 2024, 23:38) | 107 | 98 % |
| Would you like that toasted? by vitaminz (on 10. July 2024, 03:21) | 39 | 93 % |
| Anti-sudoku puzzle #3 by Nylimb (on 17. February 2020, 06:56) | 37 | 94 % |
| Little Killer Madness by djorr (on 22. September 2021, 14:00) | 40 | 93 % |
| Sealed Fate by Xendari (on 15. August 2022, 05:55) | 38 | 96 % |
| Twice a night by Fool on Hill (on 10. May 2023, 08:30) | 44 | 92 % |
