(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 | |
|---|---|---|---|
 | Yin Yang Squares by Celery (on 21. January 2023, 00:04) | 29 |  94 % |
| Palinsums by SenatorGronk (on 25. April 2023, 18:15) | 13 | 91 % |
| Stopwatch by heliopolix (on 25. August 2023, 18:09) | 35 | 93 % |
| Anti-8 Killer by Blashyrkh (on 25. September 2023, 20:51) | 84 | 94 % |
| Rule Out by loerting (on 3. December 2023, 23:41) | 14 | 91 % |
| Indirect Communication by blackjackfitz (on 19. February 2024, 15:08) | 26 | 97 % |
| Nurikabe Kurotto by Paletron (on 12. June 2024, 10:57) | 25 | 97 % |
| Quantum Superposition (Molecules, Whispers, Renban) by Crusader175 (on 22. July 2024, 16:00) | 13 | 91 % |
| Sleeper Cells by Bearded Fool (on 30. August 2024, 12:00) | 34 | 92 % |
| Arrow 100 by Mad-Tyas (on 2. September 2024, 13:30) | 25 | 90 % |
| [TSL][S1T1] Per-Pea-Tuate by SamuPiano (on 17. October 2024, 15:44) | 14 | 91 % |
| A Breath of Cold Glass by heliopolix (on 16. December 2024, 02:17) | 38 | 91 % |
| Domino Effect by vitaminz (on 12. April 2024, 15:49) | 61 | 97 % |
| Little (Killer)^2 by Lisztes (on 30. December 2020, 01:00) | 35 | 96 % |
| Sudoku Variants Series (369) - Killer - Hidden Arrows Sudoku by Richard (on 4. May 2022, 01:00) | 73 | 96 % |
| Floodwaters by Jay Dyer (on 9. July 2022, 00:45) | 69 | 97 % |
| Intertwined by siron2133 (on 29. October 2022, 11:34) | 36 | 91 % |
| Neon Neko by Senip (on 16. July 2023, 17:58) | 39 | 93 % |
| ☾ 10-Suȵ Loop ☼ by ElChiglia (on 28. October 2023, 08:05) | 38 | 95 % |
| Maximus Unique by Klvsched (on 24. June 2024, 14:00) | 105 | 95 % |
