(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 | |
|---|---|---|---|
 | Beyond the Veil by XeonRisq (on 7. November 2021, 02:00) | 16 |  92 % |
| Negativity by jwsinclair (on 31. January 2022, 22:13) | 32 | 95 % |
| Surroundings by PetLov (on 28. September 2022, 21:25) | 16 | 90 % |
| Spin City by Bremster (on 26. November 2022, 04:47) | 87 | 95 % |
| Low Tide by Schwupel (on 18. August 2023, 21:25) | 50 | 92 % |
| Brötchenstempel by Myxo (on 12. March 2024, 10:24) | 35 | 97 % |
| Stolen Numerals XV*3 by NurglesGift (on 6. July 2024, 22:12) | 64 | 96 % |
| Elevator Action (First Hidden Skyscraper Sudoku) by glum_hippo (on 19. July 2024, 16:16) | 15 | 98 % |
| Slitherlink Region Sum Hexuro by Nell Gwyn (on 22. July 2024, 07:10) | 15 | 98 % |
| Split Pea Loup by yttrio (on 21. September 2024, 04:46) | 28 | 91 % |
| 14 Givens by lepton (on 4. February 2024, 04:34) | 99 | 96 % |
| Yin-Yang Sudoku by Phistomefel (on 12. December 2020, 20:26) | 70 | 96 % |
| Popcorn by PulverizingPancake (on 6. February 2023, 17:16) | 56 | 92 % |
| Tightly Packed by Cane_Puzzles (on 3. February 2022, 12:01) | 86 | 96 % |
| Battle With The Archers 17: Precision by Playmaker6174 (on 24. September 2021, 14:00) | 40 | 99 % |
| Starburst (Antiknight Arrows) by Florian Wortmann (on 19. June 2022, 15:06) | 46 | 91 % |
| Locust by antiknight (on 5. August 2022, 00:03) | 38 | 93 % |
| A Bigger Squish by marty_sears (on 18. December 2023, 17:35) | 37 | 93 % |
| Adaptation by mathpesto (on 18. January 2025, 17:49) | 71 | 98 % |
| Anti-Knight Killer Sudoku #2 by udukos (on 2. March 2021, 10:19) | 63 | 95 % |
