(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 | |
|---|---|---|---|
 | Segue Ursa by Prof.Dori (on 18. January 2024, 01:21) | 36 |  98 % |
| X-in V-ang by NurglesGift (on 9. November 2025, 15:25) | 44 | 91 % |
| Cabo Verde by Qodec (on 3. October 2022, 20:17) | 112 | 99 % |
| Quatre Coins: Four Corners 2 (Kropki Arrow X) by tallcat (on 11. July 2021, 14:51) | 70 | 95 % |
| Boxed In (German Whispers Renban Sudoku) by Cane_Puzzles (on 3. September 2021, 17:50) | 68 | 97 % |
| Lux Umbra (Anti/Quadruples, Numbered Rooms) by Crusader175 (on 4. July 2023, 19:00) | 65 | 96 % |
| Why Fog So Bad At Archery? (Happy Birthday ViKingPrime!) by vitaminz (on 20. April 2025, 14:27) | 79 | 93 % |
| Cave of Killers by Jay Dyer (on 22. April 2024, 23:41) | 126 | 97 % |
| Fare thee well, Miss Carousel by Phistomefel (on 12. July 2024, 17:38) | 129 | 98 % |
| Three of a Kind / Deutsche: Drilling by apiyo (on 1. October 2020, 11:44) | 36 | 92 % |
| Arrow Squaring [Killer, Arrow] by Miky (on 31. August 2021, 21:43) | 29 | 95 % |
| Learn the Alphabet: B is for Between Line by Crusader175 (on 26. January 2022, 17:30) | 37 | 95 % |
| Canal View Sudoku by KNT (on 27. July 2022, 03:51) | 59 | 97 % |
| Entropic Expansion by magnageas (on 25. September 2022, 23:05) | 31 | 98 % |
| Killer Inception by mnasti2 (on 27. October 2022, 23:00) | 29 | 94 % |
| Tuning Forks #3 by Blashyrkh (on 28. March 2023, 12:09) | 30 | 95 % |
| Shuriken by XeonRisq (on 4. June 2023, 22:00) | 64 | 94 % |
| Eindeutig Zweideutig by Wuschel (on 26. May 2025, 14:20) | 33 | 90 % |
| Renban or Ren_an (Ambiguity Puzzle) by tallcat (on 11. December 2025, 03:41) | 24 | 92 % |
| Brink by 99%Sneaky (on 22. May 2025, 20:56) | 113 | 95 % |
