(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 | |
|---|---|---|---|
 | Happy Birthday, marcmees! by ibag (on 15. August 2020, 00:00) | 19 |  100 % |
| Killer Sudoku - The Knot by Phistomefel (on 31. August 2020, 23:10) | 101 | 99 % |
| House Party by DadJokes (on 6. November 2023, 20:16) | 20 | 97 % |
| Coatlicue by aqjhs (on 12. December 2024, 14:41) | 47 | 94 % |
| Signpost Nanro (Aqre) by KNT (on 12. April 2025, 23:06) | 45 | 94 % |
| 2024 Chaotic X-Sums by Florian Wortmann (on 10. January 2024, 19:23) | 124 | 98 % |
| Japanese Sums Fillomino (10x10) by Jesper (on 2. December 2021, 09:41) | 58 | 99 % |
| Sandwich Battle 2 by Strosahl (on 22. September 2020, 19:22) | 37 | 94 % |
| Anableps (Aquarium + Myopia) by sfushidahardy (on 17. February 2025, 17:38) | 37 | 97 % |
| Roller Coaster mit Extras 12 by Uhu (on 9. March 2019, 22:13) | 45 | 95 % |
| Ignorant Killer Sudoku - Part 2 by ProwlingTiger (on 12. May 2020, 23:10) | 17 | 98 % |
| NonoSums by Mark Sweep (on 4. October 2020, 20:41) | 17 | 98 % |
| Exploded Compass Sudoku by stephane.bura (on 28. February 2021, 09:00) | 16 | 98 % |
| Digital Roots by Andrewsarchus (on 3. October 2021, 19:30) | 16 | 98 % |
| Think outside the snake by filuta (on 25. June 2022, 21:13) | 46 | 96 % |
| Ban it twice! (Yin Yang, Renban) by Paletron (on 17. August 2023, 22:41) | 18 | 98 % |
| Horses are better in pairs by chameleon (on 12. April 2024, 11:47) | 33 | 94 % |
| Sparkle by Myxo (on 21. April 2024, 13:00) | 46 | 95 % |
| Friendly Mean Thermo by Prof.Dori (on 12. August 2024, 19:21) | 16 | 94 % |
| Nine in the Afternoon by Neokart (on 9. September 2024, 13:00) | 17 | 92 % |
