(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 | |
|---|---|---|---|
 | Mods & Quads by marty_sears (on 14. October 2023, 00:11) | 82 |  93 % |
| 2024 by starwarigami (on 31. December 2023, 00:00) | 65 | 96 % |
| Zodiac (Cipher Japanese Sums Deconstruction) by tallcat (on 6. May 2024, 08:00) | 50 | 94 % |
| The church of not three by filuta (on 29. August 2024, 23:56) | 47 | 98 % |
| Enigma Sequence by XeonRisq (on 31. August 2024, 20:00) | 20 | 95 % |
| Campobasso (XY-Difference-Paare) by glum_hippo (on 1. October 2024, 15:33) | 18 | 92 % |
| Double, Cross by Black_Doom (on 18. November 2024, 05:54) | 69 | 98 % |
| Marble hodgepodge by NicoD (on 5. April 2025, 05:27) | 31 | 93 % |
| Mictlāntēcutli (Castle Wall + U-Bahn) by sfushidahardy (on 21. May 2025, 05:37) | 40 | 97 % |
| The Apple Bush and The Apple Tree by JMoat13 (on 23. May 2025, 16:06) | 32 | 95 % |
| Rank X-Sums by damo_89 (on 5. September 2025, 22:30) | 27 | 92 % |
| Ice Court by .proxz14 (on 19. October 2025, 10:04) | 21 | 97 % |
| Top Right Boi (Numbered Region Chaos Construction) by MaizeGator (on 23. June 2025, 03:57) | 77 | 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 % |
| X---V*Parity Quads by NurglesGift (on 18. April 2025, 05:47) | 70 | 96 % |
| 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 % |
| Horseshoes and Handgrenades by purpl (on 15. September 2021, 17:23) | 47 | 98 % |
| Unzipped by marty_sears (on 30. October 2023, 00:41) | 50 | 97 % |
