(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 | |
|---|---|---|---|
 | Invasion! by Sotehr (on 27. October 2024, 00:00) | 12 |  93 % |
| Sudoku Variants Series (290) - Product Ltd Sudoku by Richard (on 14. October 2020, 00:00) | 62 | 94 % |
| Even knights fear arrows by Phistomefel (on 19. November 2020, 19:09) | 93 | 96 % |
| Zadra by IcyFruit (on 14. March 2024, 15:55) | 63 | 95 % |
| Killer of the Seas by Piatato (on 9. June 2021, 13:57) | 53 | 99 % |
| Recombination by Jay Dyer (on 11. October 2021, 20:05) | 20 | 96 % |
| Sum-thing's Wrogn by Jay Dyer (on 5. February 2022, 13:43) | 17 | 100 % |
| Sudoku Variants Series (385) - Consecutive Sums Sudoku by Richard (on 21. September 2022, 02:00) | 80 | 99 % |
| 30-1=29 by EricRathbun (on 15. January 2023, 01:58) | 19 | 95 % |
| A Song of Ice and Fire by SenatorGronk (on 17. February 2025, 22:29) | 15 | 91 % |
| Arrow City by PotatoHead21 (on 18. January 2022, 20:32) | 39 | 95 % |
| It's all about sharing by Emphyrio (on 3. February 2023, 17:50) | 36 | 97 % |
| Heranwachsende Rundwege by Calavera (on 27. November 2010, 20:38) | 52 | 99 % |
| Kropki x-sums sudoku by Aspartagcus (on 18. November 2021, 19:45) | 54 | 100 % |
| Pseudocount by I Love Sleeping (on 9. November 2024, 15:30) | 19 | 91 % |
| Lacunae (Sortadoku/Sandwich/Projected Sums) by dumediat (on 26. November 2023, 16:29) | 49 | 96 % |
| Tinker by randall (on 21. September 2024, 09:18) | 24 | 90 % |
| Inner Skyscrapers by tesseralis (on 30. September 2022, 23:08) | 69 | 98 % |
| The 12 Regions of Christmas by IcyFruit (on 15. December 2023, 10:37) | 56 | 97 % |
| Long range archery by filuta (on 1. September 2022, 18:20) | 27 | 98 % |
