(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 | |
|---|---|---|---|
 | The Difference Between a Cage by Mr.Goodkitteh (on 28. April 2021, 15:47) | 19 |  98 % |
| Sudoku Variants Series (347) - Sudoku Connon by Richard (on 17. November 2021, 00:00) | 59 | 97 % |
| Black Jack by Andrewsarchus (on 5. December 2021, 07:02) | 17 | 98 % |
| Cursor by ICHTUES (on 26. December 2021, 06:00) | 16 | 95 % |
| Fire Watchers by Angelo (on 15. March 2022, 23:09) | 18 | 97 % |
| Gyroscope 3.0 by Ambrose (on 7. August 2022, 17:46) | 38 | 96 % |
| Position Sums: Fillomino (11x11) by ONeill (on 20. October 2022, 05:59) | 37 | 100 % |
| SC25 - Projected Sums by kuraban (on 25. November 2022, 09:32) | 20 | 95 % |
| Pune by MavericksJD (on 30. March 2023, 12:51) | 99 | 98 % |
| Sacred Crypt by Allagem (on 6. May 2023, 08:15) | 58 | 95 % |
| Renbanwiches by Ennead (on 26. June 2024, 13:56) | 19 | 93 % |
| Zodiac Project: Minefield Maneuvers by SamuPiano (on 30. June 2024, 15:00) | 54 | 97 % |
| A Hero Emerges by Joseph nehme (on 29. August 2024, 08:04) | 85 | 91 % |
| Killer Sudoku: The Fearsome Twelves by Playmaker6174 (on 1. December 2022, 19:43) | 56 | 97 % |
| Table for Four - Easy as Pentomino by uvo (on 19. August 2014, 12:43) | 31 | 93 % |
| Für Luca zum Geburtstag: Krypto-Inselrundweg by CHalb (on 4. November 2019, 09:29) | 29 | 95 % |
| 15x15 Standard Pentominous by stefliew (on 28. March 2021, 08:46) | 35 | 99 % |
| B-2 spirits by Joseph nehme (on 22. May 2021, 11:02) | 36 | 95 % |
| Archer's Tale: The Roundtable by Playmaker6174 (on 7. October 2022, 11:26) | 32 | 97 % |
| Double Decker Sandwiches by RockyRoer (on 19. November 2022, 12:58) | 36 | 93 % |
