(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 | |
|---|---|---|---|
 | Close Enough by IcyFruit (on 11. April 2024, 15:54) | 117 |  97 % |
| Pulling Teeth (Nonconsecutive arrows) by Farkov (on 28. July 2021, 08:48) | 35 | 90 % |
| Heavy Ominoes by Jay Dyer (on 19. May 2024, 23:48) | 44 | 97 % |
| 100 by Klvsched (on 14. August 2024, 12:51) | 39 | 98 % |
| Crossbar by purpl (on 12. August 2021, 07:12) | 35 | 94 % |
| Chaos Construction: 2nd Region X-Sums #1 (8x8) by Jesper (on 3. April 2022, 16:03) | 70 | 100 % |
| Dania: Uncharted Territories by antiknight (on 7. May 2022, 19:04) | 36 | 96 % |
| Nurimisaki Sudoku - Whispers by Mark Sweep (on 9. November 2022, 16:15) | 42 | 97 % |
| Seven High by Die Hard (on 1. September 2023, 05:54) | 40 | 92 % |
| Entropy Minimalism by Mad-Tyas (on 10. January 2022, 13:01) | 74 | 96 % |
| 1001-Nacht-Rundweg by ibag (on 4. November 2013, 00:00) | 31 | 97 % |
| 10-in-9 calcudoku #1 by Nylimb (on 27. January 2020, 10:04) | 33 | 97 % |
| EUROPA - Buchstabenpyramide / letter pyramid by DocLogic (on 17. July 2020, 17:07) | 34 | 96 % |
| Sandwich Capsules by RockyRoer (on 28. March 2021, 22:17) | 39 | 99 % |
| The Incomplete Diamond by Niverio (on 14. July 2021, 15:19) | 35 | 96 % |
| Slangen (ft. Dorlir) by Nordy (on 10. July 2024, 06:28) | 33 | 98 % |
| What's in the Box? by lmdemasi (on 22. August 2024, 13:56) | 41 | 96 % |
| Fillomino sudoku by Aspartagcus (on 26. March 2024, 13:39) | 108 | 95 % |
| Little Big Killer Sudoku (updated) by Shinya (on 16. June 2020, 08:00) | 37 | 98 % |
| Arrowslits by antiknight (on 19. September 2022, 18:50) | 34 | 94 % |
