(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 | |
|---|---|---|---|
 | Product Sum Yin Yang by Scojo (on 17. June 2025, 04:10) | 42 |  93 % |
| Flat Cosmos (Chaos Construction) by sfushidahardy (on 13. August 2024, 23:53) | 82 | 99 % |
| Evil Eyes 4 v. 4 by Luigi (on 17. June 2010, 14:45) | 20 | 97 % |
| Wichtel 2019 (5): Japanische Pentominoplätzchen by wichtel (on 25. August 2020, 05:01) | 35 | 99 % |
| Interception (Arrow Sudoku) by tallcat (on 1. September 2021, 14:30) | 42 | 96 % |
| 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) | 24 | 91 % |
| Renban Non-con by yttrio (on 21. April 2023, 20:26) | 42 | 96 % |
| Build Your Own Nuri-Maze #2: Oddsweeper Square by Myxo (on 26. January 2024, 20:13) | 21 | 93 % |
| Mount Elbrus (Killer sudoku with doublers) by Qodec (on 4. February 2024, 17:22) | 131 | 97 % |
| Wichtels Rätselsommer 2024 (3): Diebische Wichtel by wichtel (on 17. August 2024, 20:23) | 20 | 99 % |
| Mounting Pressure (Between Lines) by Blashyrkh (on 3. September 2024, 11:57) | 43 | 96 % |
| Schrödinger's Pseudoku by starwarigami (on 27. February 2025, 19:37) | 22 | 90 % |
| Boogie by Andrewsarchus (on 21. March 2025, 05:18) | 40 | 92 % |
| A Clockwork Orange by .proxz14 (on 29. March 2025, 11:11) | 18 | 93 % |
| Noodles by Paletron (on 10. May 2024, 22:08) | 58 | 97 % |
| Agathokakological by NicoD (on 25. June 2025, 05:30) | 67 | 94 % |
| Compass Fillomino #5: Large Ring by MagnusJosefsson (on 3. September 2021, 10:59) | 38 | 96 % |
| Projections (Killer Parity) by tallcat (on 12. November 2022, 08:00) | 37 | 96 % |
| WPC Preparation 2019: Loopfinder by pwahs (on 3. January 2021, 16:23) | 17 | 93 % |
