(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 | |
|---|---|---|---|
 | Chromatic Quiver by Xendari (on 28. March 2022, 06:19) | 90 |  98 % |
| Primal Instinct (Killer Sudoku) by Agent (on 25. July 2023, 09:00) | 151 | 97 % |
| Schwarz oder Weiß Koralle III by tuace (on 4. October 2015, 17:09) | 47 | 96 % |
| Build Your Own Killer: Master Designer 2 by Playmaker6174 (on 18. September 2023, 00:00) | 46 | 95 % |
| Taron [Fog of War] by IcyFruit (on 23. May 2024, 13:16) | 128 | 97 % |
| Smus-X by Qodec (on 25. September 2022, 14:44) | 60 | 95 % |
| Extragalactic by zegres (on 8. January 2024, 04:49) | 83 | 98 % |
| Japanische Summen - Doppelrätsel mit Primzahlen by ibag (on 27. April 2012, 11:49) | 68 | 99 % |
| So oder so: Koralle mit Doppelsternen by CHalb (on 30. July 2015, 16:24) | 41 | 97 % |
| Parity Party V — "Vortex Temporum" by glum_hippo (on 19. April 2020, 06:21) | 31 | 91 % |
| A Lying Stars Mystery Killer by Djmelee3000 (on 24. September 2020, 21:07) | 29 | 98 % |
| Position Sums (Odd-even coded) by Realshaggy (on 5. February 2021, 12:00) | 42 | 98 % |
| Multi-sudoku: Orb by DiMono (on 9. April 2021, 16:38) | 38 | 98 % |
| Turtle by Arka Badarka (on 15. July 2021, 04:20) | 22 | 93 % |
| FARBMISCHUNG - Buchstabenrätsel / Color Mix - letter puzzle by DocLogic (on 28. November 2021, 11:11) | 30 | 97 % |
| Negativity by jwsinclair (on 31. January 2022, 22:13) | 30 | 96 % |
| Shrek's Sums by twototenth (on 8. March 2022, 08:00) | 19 | 95 % |
| Wack by the_cogito (on 22. May 2022, 16:34) | 26 | 99 % |
| Regional Variants (ambiguous region sum lines) by AnalyticalNinja (on 4. June 2022, 02:54) | 33 | 98 % |
| Ye Olde Inn by Qodec (on 11. June 2022, 23:32) | 56 | 95 % |
