(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 | |
|---|---|---|---|
 | Quaere (Kropki + Counting Quads) by tallcat (on 26. June 2024, 23:37) | 48 |  97 % |
| Don't open the box by sanabas (on 4. July 2024, 15:05) | 14 | 93 % |
| Wichtels (später) Rätselsommer 2024 (11): Wichtel-Zwietracht by wichtel (on 11. October 2024, 20:23) | 12 | 100 % |
| Chaotic Archery - Chaos Construction Sudoku by Mr.Menace (on 12. May 2022, 22:51) | 69 | 97 % |
| Bafflement by Xenonetix (on 3. October 2022, 01:10) | 53 | 100 % |
| Chromosomes by ThePedallingPianist (on 3. January 2023, 01:15) | 106 | 96 % |
| Splatter by PotatoHead21 (on 23. July 2021, 03:35) | 45 | 91 % |
| Hangover by Realshaggy (on 13. February 2022, 17:03) | 40 | 97 % |
| Entropy Focus by Mad-Tyas (on 8. September 2022, 14:54) | 44 | 96 % |
| Perfectly Average Killers by Tacosian (on 14. March 2023, 03:13) | 42 | 94 % |
| Japanische Summen-Koralle 2358 by Uhu (on 27. December 2016, 14:23) | 53 | 98 % |
| In Between Disjoint Killings by tenaliraman (on 16. January 2021, 18:39) | 32 | 98 % |
| Schrödinger's Arrows by starwarigami (on 14. January 2022, 04:34) | 28 | 96 % |
| 8-Color Theorem by the_cogito (on 14. June 2022, 19:10) | 28 | 97 % |
| The Swamp (Nurikabe Fillomino) by MaizeGator (on 16. July 2024, 16:37) | 34 | 96 % |
| Thermo Arrow Sudoku by Phistomefel (on 24. May 2021, 04:16) | 89 | 96 % |
| Fog of Chaos by lepton (on 26. February 2023, 18:09) | 178 | 92 % |
| 真笑Puzzles007:Bachelor(光棍) Sudoku02 by cdwg2000 (on 23. December 2020, 22:43) | 15 | 92 % |
| Charybdis by Gliperal (on 21. March 2021, 05:46) | 47 | 97 % |
| Palindrome Builder by Quarterthru (on 10. July 2021, 17:00) | 16 | 94 % |
