(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 | |
|---|---|---|---|
 | Schatzsuche - Finale by AI1463 (on 31. July 2014, 14:06) | 32 |  98 % |
| Roller Coaster mit Extras 15 by Uhu (on 24. June 2019, 18:07) | 34 | 99 % |
| Unwrap the Gifts [2 for 1 special] by TotallyNormalCat (on 20. March 2021, 20:00) | 17 | 98 % |
| Multi-sudoku: Orb 2 by DiMono (on 23. April 2021, 07:58) | 23 | 99 % |
| Poison Arrow by FryTheGuy (on 23. April 2021, 20:14) | 15 | 93 % |
| Region Geometry by kolot (on 13. May 2022, 18:29) | 69 | 100 % |
| Shards by grkles (on 31. May 2022, 12:00) | 22 | 90 % |
| The Victoria Sandwich Is A Lie by fjam (on 8. June 2022, 17:50) | 15 | 96 % |
| Friends in unknown lands (chaos construction) by filuta (on 11. June 2022, 13:10) | 18 | 93 % |
| Wichtel 2021 (4): Körbiks innere Ruhe by wichtel (on 27. July 2022, 22:01) | 22 | 96 % |
| Twilight Cave Sudoku by PixelPlucker (on 27. July 2022, 08:54) | 14 | 94 % |
| 8x8=9x9 by filuta (on 13. August 2022, 17:30) | 18 | 99 % |
| Chaos Construction: Orpheus (10x10) by KNT (on 16. August 2022, 01:09) | 48 | 97 % |
| One piece by lerroyy (on 25. September 2022, 22:48) | 22 | 97 % |
| Eternal Entropy by Mad-Tyas (on 28. September 2022, 12:15) | 19 | 93 % |
| Chaos in the Knighttime by SenatorGronk (on 5. October 2022, 15:56) | 16 | 98 % |
| Out of the way by PrimeWeasel (on 18. October 2022, 10:13) | 15 | 92 % |
| Japanese Sum Cave Cipher #8: 25 by KNT (on 9. December 2022, 00:00) | 32 | 99 % |
| Thermogonal Deluxe [Thermo Shivers Sudoku] by wisty (on 24. December 2022, 05:11) | 17 | 100 % |
| Solaris by Kafkapharnaum (on 3. March 2023, 15:34) | 13 | 95 % |
