(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 | |
|---|---|---|---|
 | Fifteen by Die Hard (on 20. March 2024, 00:27) | 26 |  98 % |
| Noodles by Paletron (on 10. May 2024, 22:08) | 56 | 97 % |
| Parity Quads by NurglesGift (on 9. February 2025, 18:32) | 56 | 93 % |
| Zebediah Killgrave by starwarigami (on 24. November 2023, 10:01) | 76 | 95 % |
| Chaos by Nahileon (on 26. February 2022, 19:06) | 25 | 98 % |
| Chillicothe by glum_hippo (on 4. October 2023, 18:11) | 51 | 94 % |
| Mount Elbrus (Killer sudoku with doublers) by Qodec (on 4. February 2024, 17:22) | 128 | 97 % |
| Vampires Magnet Butterfly by damasosos92 (on 15. April 2024, 16:40) | 27 | 93 % |
| Push and Pull by arbitrary (on 29. August 2024, 00:54) | 47 | 97 % |
| Fillomino Aquarium by Phistomefel (on 16. January 2022, 00:44) | 90 | 100 % |
| A Powerful Duo (Entropy, Anti-Knight) by Mad-Tyas (on 16. May 2023, 09:08) | 47 | 95 % |
| Flat Cosmos (Chaos Construction) by sfushidahardy (on 13. August 2024, 23:53) | 81 | 99 % |
| Wichtel 2019 (5): Japanische Pentominoplätzchen by wichtel (on 25. August 2020, 05:01) | 35 | 99 % |
| Parity Party XXIV, "Fast Times" by glum_hippo (on 30. November 2022, 17:14) | 19 | 96 % |
| Geometry Experiment 2 by Jeet Sampat (on 5. March 2023, 14:25) | 23 | 91 % |
| Renban Non-con by yttrio (on 21. April 2023, 20:26) | 41 | 96 % |
| Doubler XL by thoughtbyte (on 6. September 2023, 00:07) | 61 | 98 % |
| Sandwich X Circles by ICHTUES (on 8. October 2023, 06:00) | 20 | 91 % |
| Build Your Own Nuri-Maze #2: Oddsweeper Square by Myxo (on 26. January 2024, 20:13) | 21 | 93 % |
| Mounting Pressure (Between Lines) by Blashyrkh (on 3. September 2024, 11:57) | 43 | 96 % |
