(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 | |
|---|---|---|---|
 | Consecutiveness by Niverio (on 1. August 2021, 11:47) | 55 |  95 % |
| Staggered by the_cogito (on 26. November 2021, 03:31) | 57 | 97 % |
| Bounds of Luck (Whisper MinMax) by tallcat (on 21. September 2022, 03:46) | 60 | 95 % |
| In The Zone by EdTheAlchemist (on 4. November 2025, 13:54) | 72 | 94 % |
| Sudoku Variants Series (387) - Adjacent Products Sudoku by Richard (on 5. October 2022, 02:00) | 76 | 94 % |
| Siamese Rundweg Sudoku Twins 6x6 by pokerke (on 11. December 2010, 21:40) | 50 | 99 % |
| Renban Pünktchen Spektakel by Luigi (on 27. June 2011, 13:10) | 30 | 95 % |
| 123... Schiffe versenken by lupo (on 23. May 2015, 00:00) | 30 | 93 % |
| ECKIG - RUND - OVAL - Buchstabenrätsel by DocLogic (on 23. May 2020, 00:31) | 34 | 95 % |
| Snake Sum Sudoku 6 by Quarterthru (on 15. July 2020, 20:00) | 19 | 98 % |
| Double Value Killer Sudoku by Willy Wonka (on 30. August 2020, 07:18) | 40 | 97 % |
| Divisible Cage Totals #2 (oops! no totals!) by RockyRoer (on 30. October 2020, 10:56) | 33 | 96 % |
| Juicebox by TotallyNormalCat (on 18. December 2020, 23:00) | 25 | 96 % |
| Four Killer Winds by Franjo (on 24. May 2021, 18:49) | 16 | 96 % |
| Sandwich Fillomino #3 by Mark Sweep (on 31. December 2021, 10:00) | 17 | 96 % |
| Cowgirl by OhHeyGuysItsMax (on 18. February 2022, 19:34) | 53 | 92 % |
| Alpes by lerroyy (on 26. February 2022, 20:52) | 22 | 91 % |
| Assassin9 (Irregular Killer Arrow Sudoku) by Ore (on 5. May 2022, 00:00) | 19 | 96 % |
| Throwing Shade by tesseralis (on 19. June 2022, 01:25) | 29 | 98 % |
| Frankly by wooferzfg (on 20. July 2022, 17:44) | 16 | 93 % |
