(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 | |
|---|---|---|---|
 | Double, Cross by Black_Doom (on 18. November 2024, 05:54) | 70 |  98 % |
| Marble hodgepodge by NicoD (on 5. April 2025, 05:27) | 31 | 93 % |
| The Apple Bush and The Apple Tree by JMoat13 (on 23. May 2025, 16:06) | 32 | 95 % |
| have you had enough? by aqjhs (on 28. December 2025, 01:23) | 65 | 96 % |
| Rank X-Sums by damo_89 (on 5. September 2025, 22:30) | 27 | 92 % |
| Ice Court by .proxz14 (on 19. October 2025, 10:04) | 22 | 97 % |
| Top Right Boi (Numbered Region Chaos Construction) by MaizeGator (on 23. June 2025, 03:57) | 78 | 100 % |
| RiesenRenbanKropki II by Richard (on 9. April 2010, 12:00) | 67 | 91 % |
| A Puzzle in Two Parts by jsmirob (on 12. December 2022, 05:58) | 81 | 95 % |
| The Big Zipper by marty_sears (on 1. November 2023, 14:04) | 144 | 95 % |
| The Clues, the Whole Clues, and Nothing but the Clues. by Abdul the Killer (on 23. July 2024, 12:34) | 71 | 97 % |
| Triples - Killer Sudoku by Mr.Menace (on 7. May 2021, 13:47) | 56 | 95 % |
| Arvada - a Beachcomber Sudoku by glum_hippo (on 3. November 2023, 04:20) | 57 | 96 % |
| Sett Theory by marty_sears (on 11. August 2024, 20:47) | 116 | 98 % |
| Horseshoes and Handgrenades by purpl (on 15. September 2021, 17:23) | 47 | 98 % |
| Unzipped by marty_sears (on 30. October 2023, 00:41) | 51 | 97 % |
| Circuit Board [Standard U-Bahn] by wisty (on 14. November 2023, 17:10) | 43 | 99 % |
| 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 % |
| Consecutive Steps by Scruffamudda (on 5. April 2023, 08:20) | 42 | 94 % |
