(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 | |
|---|---|---|---|
 | Octopus Knight (Octopus Rules, Chess Lines) by gdc (on 10. June 2024, 15:51) | 25 |  94 % |
| Camouflage (Loop Sum Sudoku) by Agent (on 9. July 2024, 09:00) | 25 | 99 % |
| Cruel-sum Samurai (Duality lines, Mean minis, 6x6 Samurai) by AnalyticalNinja (on 21. September 2024, 18:53) | 41 | 94 % |
| The Fillomino Frog 2 by Die Hard (on 1. March 2025, 23:51) | 22 | 96 % |
| Let's Get Quacking! by SkepticalMario (on 18. July 2025, 20:51) | 14 | 92 % |
| Spooky Action at a Distance by juggler (on 29. October 2025, 02:13) | 94 | 92 % |
| Coordinators by mathpesto (on 6. November 2025, 21:41) | 69 | 97 % |
| Heat Exchange by EdTheAlchemist (on 9. November 2025, 11:08) | 72 | 97 % |
| Four Easy Pieces by Andrewsarchus (on 3. January 2026, 22:24) | 44 | 92 % |
| Deadly Dance of 7 and 8 by NXTMaster (on 23. January 2026, 00:00) | 29 | 93 % |
| Rank Up 20.mg12.3 - Fill-rank-omino by MathGuy_12 (on 27. January 2026, 00:11) | 48 | 92 % |
| Tree of Life by juggler (on 7. April 2025, 00:51) | 285 | 98 % |
| Rhomboid Chaos by Sotehr (on 4. December 2024, 22:00) | 109 | 99 % |
| Dutch Flat Mates (Chaos Construction Shifter) - Palpot Collab by Flinty (on 16. October 2024, 11:30) | 85 | 97 % |
| Reciprocity by ICHTUES (on 26. June 2022, 06:00) | 151 | 97 % |
| Porcelain by egubachu (on 5. August 2024, 10:32) | 72 | 94 % |
| Hitman by NicoD (on 22. August 2025, 05:30) | 69 | 94 % |
| Little Killer Killer Sudoku - Pinwheel by DiMono (on 27. October 2020, 23:51) | 59 | 94 % |
| Black Rose by TotallyNormalCat (on 23. July 2022, 19:00) | 111 | 95 % |
| cento mani e cento occhi by aqjhs (on 28. October 2024, 05:22) | 63 | 96 % |
