(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 | |
|---|---|---|---|
 | Alles Gute, Mody! by ibag (on 20. April 2021, 00:00) | 13 |  96 % |
| Not Between Sudoku by stephane.bura (on 29. May 2021, 04:07) | 12 | 98 % |
| Laser ohne Innenhinweise by Uhu (on 31. May 2021, 19:48) | 14 | 98 % |
| Albert I, King of the Belgians by Bais (on 13. August 2021, 03:17) | 21 | 94 % |
| Dalek's Dilemma by apiyo (on 20. August 2021, 04:51) | 15 | 96 % |
| Impossible Rope Trick? by Skunkworks (on 9. May 2022, 17:18) | 19 | 94 % |
| Twinkle Twinkle by starwarigami (on 15. May 2022, 21:18) | 13 | 92 % |
| Balance of Power by Raumplaner (on 26. June 2022, 14:40) | 20 | 98 % |
| Archery Range by grkles (on 12. July 2022, 17:05) | 40 | 92 % |
| Balanced Sudoku by Nell Gwyn (on 6. August 2022, 04:03) | 13 | 94 % |
| -X Sums by JeremyDover (on 5. October 2022, 23:23) | 13 | 98 % |
| Vice Versa by ICHTUES (on 20. November 2022, 06:00) | 15 | 98 % |
| Square Dance by cristophermoore (on 16. February 2023, 19:24) | 63 | 94 % |
| U-Bahn (2) by KNT (on 15. April 2023, 06:02) | 48 | 99 % |
| Toasted Sandwich (Sums next to 1 and 9 sudoku) by Qodec (on 31. May 2023, 14:00) | 33 | 96 % |
| Islands 3: Another Archipelagic Discovery by SamuPiano (on 21. July 2023, 01:44) | 14 | 100 % |
| Partition by 3good5you (on 27. July 2023, 08:56) | 14 | 94 % |
| Empty Circles by Qodec (on 20. October 2023, 17:32) | 75 | 95 % |
| Zipper Zipper by antiknight (on 20. December 2023, 03:32) | 28 | 100 % |
| Sudoku Variants Series (278) - Position Sums Sudoku by Richard (on 22. July 2020, 00:00) | 100 | 98 % |
