(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 Swamp (Nurikabe Fillomino) by MaizeGator (on 16. July 2024, 16:37) | 41 |  95 % |
| Decoder [Akari Japanese Sums Fillomino] by wisty (on 25. December 2024, 15:31) | 26 | 99 % |
| Navigation by ThePedallingPianist (on 7. December 2024, 18:48) | 17 | 93 % |
| E : y² + xy = x³ + 12948x + 421776 by aqjhs (on 20. February 2025, 11:36) | 17 | 93 % |
| Parity Parity by vitaminz (on 3. July 2025, 15:18) | 101 | 95 % |
| Chaotic 3D Full Rank by SparkNights (on 23. August 2025, 09:03) | 19 | 98 % |
| Arrows Usually Include Low Digits by Md88keys (on 2. December 2025, 01:11) | 74 | 95 % |
| Marco Polo (Loop Deconstruction) by Agent (on 6. June 2023, 09:00) | 100 | 98 % |
| Chaos Construction: Numbered Regions #2 by Jesper (on 2. October 2022, 15:14) | 93 | 100 % |
| Whisper Cave Sudoku by KNT (on 19. May 2022, 08:53) | 78 | 97 % |
| Bafflement by Xenonetix (on 3. October 2022, 01:10) | 59 | 100 % |
| [Fog of War Series] 4. Labyrinth by AstralSky (on 3. November 2022, 15:51) | 57 | 91 % |
| Shady Fillomino by Agent (on 18. June 2024, 09:00) | 49 | 97 % |
| Fishnet by TotallyNormalCat (on 22. February 2022, 02:30) | 92 | 97 % |
| Missing Quads by antiknight (on 28. June 2022, 19:05) | 42 | 93 % |
| 6 Arrows by Jeet Sampat (on 25. September 2022, 22:46) | 43 | 97 % |
| Polymorphic Chaos by thoughtbyte (on 22. August 2023, 13:53) | 71 | 98 % |
| String Quartet by IcyFruit (on 5. November 2023, 01:26) | 79 | 95 % |
| Yozzy by zetamath (on 6. May 2024, 02:28) | 41 | 95 % |
| Ready For Launch by Niverio (on 7. May 2024, 10:19) | 42 | 95 % |
