(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 | |
|---|---|---|---|
 | The Big Zipper by marty_sears (on 1. November 2023, 14:04) | 142 |  95 % |
| LM 2018 Countdown: U-Bahn mit Haltestellen by tuace (on 8. June 2018, 09:06) | 32 | 97 % |
| Star Nurikabe #47 by BenceJoful (on 31. August 2021, 18:04) | 42 | 98 % |
| Cubic Doublers by Blobz (on 7. November 2022, 16:00) | 43 | 93 % |
| Consecutive Steps by Scruffamudda (on 5. April 2023, 08:20) | 42 | 94 % |
| Segue Ursa by Prof.Dori (on 18. January 2024, 01:21) | 36 | 98 % |
| Cabo Verde by Qodec (on 3. October 2022, 20:17) | 112 | 99 % |
| Sett Theory by marty_sears (on 11. August 2024, 20:47) | 114 | 98 % |
| 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) | 67 | 97 % |
| Lux Umbra (Anti/Quadruples, Numbered Rooms) by Crusader175 (on 4. July 2023, 19:00) | 65 | 96 % |
| The Clues, the Whole Clues, and Nothing but the Clues. by Abdul the Killer (on 23. July 2024, 12:34) | 70 | 97 % |
| Why Fog So Bad At Archery? (Happy Birthday ViKingPrime!) by vitaminz (on 20. April 2025, 14:27) | 78 | 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) | 128 | 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 % |
