(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 | |
|---|---|---|---|
 | Pointing Down by Visumation (on 22. October 2024, 11:56) | 56 |  91 % |
| German Whisper Border Dots by Md88keys (on 30. June 2025, 04:45) | 62 | 93 % |
| Sudoku Variants Series (179) - Outside Killer Sudoku by Richard (on 2. May 2017, 00:00) | 108 | 95 % |
| Shy Evens X Odds Sudoku by ICHTUES (on 7. February 2021, 06:00) | 55 | 96 % |
| Alien X-Sums Sudoku by Realshaggy (on 11. November 2022, 12:15) | 55 | 92 % |
| Two-Zip by AFrayedKnot (on 8. October 2024, 08:34) | 60 | 96 % |
| Microclimate by NicoD (on 22. June 2025, 05:30) | 131 | 95 % |
| Fearful Symmetry (Renban Killer) by tallcat (on 28. April 2025, 05:00) | 202 | 97 % |
| 11x11 Classic Star Battle by Phistomefel (on 19. August 2020, 19:31) | 185 | 93 % |
| Diamonds are Forever by Sartor (on 24. November 2025, 16:26) | 86 | 93 % |
| Fortune Cookie II by pieguy (on 20. November 2024, 01:23) | 158 | 96 % |
| Circle City by jwsinclair (on 28. January 2025, 18:44) | 74 | 97 % |
| Gerade Ungerade Koralle by tuace (on 3. November 2013, 18:30) | 66 | 93 % |
| Archery Contest: XV by I Love Sleeping (on 17. November 2024, 03:21) | 84 | 97 % |
| A Fistful of Circles (fillomino) by SkepticalMario (on 21. November 2024, 01:01) | 85 | 96 % |
| Hakata (Shikaku Chaos Construction) by sfushidahardy (on 29. July 2024, 07:53) | 92 | 99 % |
| Under Pressure (Pressurized Aquariums) by AnalyticalNinja (on 22. December 2022, 15:00) | 98 | 98 % |
| Fillomino-Yajilin-Tapa by CJK (on 4. April 2021, 21:15) | 109 | 100 % |
| A tilt at full rank by ralphwaldo1 (on 8. February 2025, 19:16) | 121 | 99 % |
| Anticamel Coloring Book by gdc (on 30. December 2024, 21:26) | 133 | 97 % |
