(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 | |
|---|---|---|---|
 | XY-Differences VI, "Delimited Edition" by glum_hippo (on 4. February 2021, 20:09) | 27 |  99 % |
| Eiger (Killer sudoku) by Qodec (on 3. December 2023, 15:41) | 154 | 96 % |
| Wichtel 2017 (4): Drei Wichtel und 144 Häuser by wichtel (on 26. May 2018, 07:04) | 37 | 99 % |
| Crypto Japanese Cave from the Underworld by KNT (on 30. October 2022, 05:29) | 37 | 99 % |
| The Big One by IcyFruit (on 25. January 2024, 14:04) | 46 | 94 % |
| Doppelgangland (Double Arrow Doublers) by tallcat (on 8. September 2025, 00:00) | 37 | 93 % |
| Detroit by ICHTUES (on 14. November 2021, 06:00) | 51 | 96 % |
| Whispers + Arrows + Renban + Sudoku X by Jeet Sampat (on 14. December 2022, 13:15) | 58 | 96 % |
| Sprengungen im Hochhausviertel II by tuace (on 18. January 2015, 23:36) | 38 | 98 % |
| Archers Defending the Castle by GBPack (on 9. May 2021, 06:41) | 54 | 98 % |
| Pentominoes Intersection by RockyRoer (on 13. September 2021, 00:54) | 27 | 99 % |
| Quorum Rings by Jay Dyer (on 23. October 2021, 17:04) | 47 | 90 % |
| Equilibrium by Mad-Tyas (on 1. November 2022, 09:41) | 66 | 98 % |
| Don't open the box by sanabas (on 4. July 2024, 15:05) | 16 | 93 % |
| X---V*9.4 by NurglesGift (on 27. September 2025, 16:29) | 44 | 95 % |
| Thermo Arrow Sudoku by Phistomefel (on 24. May 2021, 04:16) | 96 | 96 % |
| Splatter by PotatoHead21 (on 23. July 2021, 03:35) | 46 | 91 % |
| ripple by mormagli (on 29. November 2022, 22:26) | 86 | 97 % |
| Two Truths and a Lie by zetamath (on 20. September 2021, 14:48) | 162 | 98 % |
| Ta(x)i-Cab Sums: by RockyRoer (on 6. December 2020, 13:35) | 28 | 92 % |
