(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 | |
|---|---|---|---|
 | Double fillomino by filuta (on 8. December 2022, 15:38) | 17 |  100 % |
| Mysterious Boxes by fjam (on 8. January 2023, 16:19) | 24 | 91 % |
| Disambiguation by Flywinged (on 5. February 2023, 01:07) | 18 | 91 % |
| Fillomino Yajilin (10x10) by ns08 (on 8. May 2023, 00:01) | 21 | 94 % |
| Above Average On Average (Geometry Experiment 5) by Jeet Sampat (on 22. July 2023, 17:45) | 33 | 95 % |
| Sandwich X Circles by ICHTUES (on 8. October 2023, 06:00) | 17 | 93 % |
| Arrows (Arrow Sudoku) by LittleNightmaresLady (on 10. November 2023, 18:29) | 25 | 94 % |
| Bells by LittleNightmaresLady (on 24. November 2023, 18:17) | 16 | 93 % |
| Round Robin by IcyFruit (on 12. January 2024, 21:24) | 24 | 95 % |
| Yin-Yang Renbanominos 1 by Die Hard (on 29. April 2024, 07:56) | 20 | 91 % |
| Slythering [Liar Japanese Sums Snake] by Christounet (on 4. June 2024, 07:54) | 25 | 100 % |
| Unique Value Deconstruction by sfushidahardy (on 27. June 2024, 18:13) | 26 | 95 % |
| Repeat Prescription by Jay Dyer (on 21. July 2024, 00:11) | 41 | 96 % |
| Avada Kedavra - A Magic Square Killer by Philipp Huber (on 8. July 2020, 22:38) | 68 | 93 % |
| Whispers + Arrows + Renban + Sudoku X by Jeet Sampat (on 14. December 2022, 13:15) | 52 | 96 % |
| Prime-Co Sweepers by XeonRisq (on 11. January 2023, 17:00) | 43 | 100 % |
| Pack of Aces by mormagli (on 8. February 2024, 02:20) | 47 | 99 % |
| 10-in-9 Isolation Sudoku by Phistomefel (on 5. April 2020, 12:07) | 39 | 97 % |
| Antiknight Between Lines by Gliperal (on 12. May 2021, 04:19) | 38 | 97 % |
| Antiknight Killer Sudoku by PotatoHead21 (on 15. September 2021, 05:20) | 68 | 99 % |
