(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 | |
|---|---|---|---|
 | Parity Parity by vitaminz (on 3. July 2025, 15:18) | 105 |  94 % |
| Whisper Cave Sudoku by KNT (on 19. May 2022, 08:53) | 78 | 97 % |
| Quem Dixere Chaos by mathpesto (on 9. February 2022, 05:06) | 62 | 96 % |
| Marco Polo (Loop Deconstruction) by Agent (on 6. June 2023, 09:00) | 106 | 98 % |
| [Fog of War Series] 4. Labyrinth by AstralSky (on 3. November 2022, 15:51) | 58 | 91 % |
| Missing Quads by antiknight (on 28. June 2022, 19:05) | 43 | 93 % |
| Polymorphic Chaos by thoughtbyte (on 22. August 2023, 13:53) | 71 | 98 % |
| Headmaster's Toe (Anti-Knight, Renban) by juddimal (on 4. January 2025, 22:23) | 48 | 93 % |
| Entropical Pairadise (Pairrow, Yin Yang) by DubiousMobius (on 23. January 2025, 16:44) | 68 | 99 % |
| Twin Killer Sudoku III by Richard (on 8. July 2009, 14:19) | 90 | 93 % |
| Extreme Lunchbox by Undar_Beyond (on 15. May 2020, 20:32) | 33 | 90 % |
| Skyscrapers 10x10 by pandiani42 (on 6. August 2020, 12:42) | 28 | 93 % |
| Pentominoes Intersection by RockyRoer (on 13. September 2021, 00:54) | 28 | 99 % |
| Adventskalender 2023, Türchen 21 - Lügende Passierscheine by Zzzyxas (on 21. December 2023, 07:00) | 27 | 98 % |
| U-Bahn with Extra Regions by wooferzfg (on 2. July 2024, 07:46) | 27 | 96 % |
| Whispering Knight by Phistomefel (on 22. October 2021, 01:13) | 148 | 94 % |
| 4 Line Theorem by Manta-Ray (on 19. December 2025, 22:56) | 77 | 97 % |
| Two Truths And A Region (FoW) by gdc (on 3. March 2026, 17:54) | 199 | 98 % |
| Tête-á-tête (Between Line Nabner) by tallcat (on 11. September 2023, 08:00) | 54 | 95 % |
| Drainers and Sires by mathpesto (on 23. June 2025, 15:52) | 53 | 96 % |
