(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 | |
|---|---|---|---|
 | Silent Suguru by dennischen (on 27. April 2023, 01:12) | 53 |  99 % |
| Liar Japanese Sums #9 - Cave (Aqre) by Niverio (on 1. August 2024, 19:24) | 27 | 100 % |
| Subway Roundabout by Niverio (on 21. August 2024, 22:25) | 41 | 98 % |
| Cagey Architects (Dynamic FoW) by gdc (on 20. December 2024, 15:17) | 213 | 97 % |
| violently nostalgic by aqjhs (on 7. July 2025, 07:07) | 67 | 99 % |
| #sudoku by matt383 (on 26. October 2021, 21:08) | 37 | 96 % |
| Krypto-Kakuro-Koralle für pin7guin by ibag (on 6. September 2013, 00:00) | 63 | 99 % |
| Roman Lockout by Jay Dyer (on 19. February 2022, 23:16) | 24 | 94 % |
| Lookie Lookie (Doubler/Look-and-say/Renban) by dumediat (on 2. September 2022, 03:53) | 23 | 99 % |
| TRICKY - Buchstabenrätsel / Letter Puzzle by DocLogic (on 16. April 2024, 15:44) | 32 | 97 % |
| Partial Manhattan Sudoku by Madmahogany (on 29. April 2020, 14:20) | 45 | 94 % |
| ⊕ Deconstructed-RSL-Loop ⊕ by ElChiglia (on 20. April 2024, 07:15) | 49 | 92 % |
| Glowworms by mathpesto (on 17. November 2023, 00:03) | 67 | 95 % |
| Nuts and Bolts by KMD (on 15. March 2024, 10:18) | 56 | 95 % |
| Wichtel 2013 (10): Doppelschlangen-Höhle mit Doppellöwen by wichtel (on 30. May 2014, 10:32) | 28 | 99 % |
| Wichtel 2019 (11 und Schluss): Es soll nicht langweilig werden! by wichtel (on 6. November 2020, 20:01) | 18 | 100 % |
| In Between Disjoint Killings by tenaliraman (on 16. January 2021, 18:39) | 36 | 96 % |
| Kropkiominos by zetamath (on 30. May 2021, 00:17) | 40 | 97 % |
| Anti-King Killer by Jeet Sampat (on 18. November 2021, 05:00) | 19 | 93 % |
| Schrödinger's Cat's Revenge (killer, little killer) by Chilly (on 13. December 2021, 12:31) | 20 | 90 % |
