(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 | |
|---|---|---|---|
 | Tartan by grkles (on 10. July 2021, 15:49) | 17 |  97 % |
| What's with the crust these days? by filuta (on 26. July 2021, 19:55) | 16 | 98 % |
| Shikasudoku by Qodec (on 8. November 2021, 18:44) | 36 | 94 % |
| Knights of Parity by Fafrd (on 27. May 2022, 06:38) | 20 | 97 % |
| Balance of Power by Raumplaner (on 26. June 2022, 14:40) | 23 | 93 % |
| Arrangement by wooferzfg (on 23. September 2022, 07:34) | 62 | 96 % |
| Kolot Challenge Accepted by Andrewsarchus (on 7. November 2022, 14:44) | 19 | 92 % |
| Many happy returns (Land survey/Quadruples/Chaos Construction/Cipher) by dumediat (on 10. February 2023, 13:42) | 19 | 98 % |
| X-Marks the Treasure Map by Maxentius (on 22. February 2023, 01:03) | 20 | 93 % |
| SC32 - Double Arrow by kuraban (on 4. June 2023, 14:24) | 17 | 95 % |
| Sarajevo Streets - Bosnian Road Sudoku by Mr.Menace (on 5. August 2024, 09:16) | 18 | 93 % |
| dear puzzle friend by aqjhs (on 14. February 2025, 06:06) | 62 | 95 % |
| Line Items by ebiggie (on 9. December 2025, 00:06) | 29 | 90 % |
| Chaos Shikaku by KNT (on 30. May 2022, 03:26) | 50 | 98 % |
| Wichtel 2021 (9): Tapa-Doppelstern by wichtel (on 26. October 2022, 20:12) | 31 | 95 % |
| One Look Could Kill by yttrio (on 23. November 2024, 01:54) | 74 | 94 % |
| Left Turn At Albuquerque by ChinStrap (on 23. September 2025, 17:16) | 75 | 97 % |
| Checks and Balances by MSDOS (on 24. November 2025, 05:46) | 39 | 96 % |
| Horseshoes by Kaktuslav (on 29. November 2025, 08:00) | 38 | 92 % |
| Inverted Killer by NurglesGift (on 17. October 2024, 19:01) | 56 | 93 % |
