(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 | |
|---|---|---|---|
 | Fillomino Sudoku by spxtr (on 29. August 2020, 08:26) | 30 |  95 % |
| Chaos Construction: Position Sums (9x9) by Jesper (on 12. October 2021, 20:35) | 68 | 100 % |
| Nonconsecutive Killer Sudoku by spxtr (on 1. January 2021, 06:21) | 98 | 96 % |
| Chaos Construction: Numbered Regions #2 by Jesper (on 2. October 2022, 15:14) | 85 | 100 % |
| Fillomino-ish Killer Sudoku by SirWoezel (on 25. November 2020, 16:21) | 54 | 99 % |
| 2T1L by ICHTUES (on 11. September 2022, 06:00) | 68 | 95 % |
| Whisper Cave Sudoku by KNT (on 19. May 2022, 08:53) | 73 | 99 % |
| Post Office Panic! by tesseralis (on 4. July 2022, 10:14) | 75 | 98 % |
| Team Sum Sudoku by Phistomefel (on 7. May 2024, 19:32) | 81 | 97 % |
| Verrätselte Zahlenfolge by berni (on 30. March 2011, 21:27) | 31 | 97 % |
| Roller Coaster mit Extras 5 by Uhu (on 11. March 2018, 13:50) | 57 | 99 % |
| Negatively Constrained Slingshot Sudoku by stephane.bura (on 6. August 2020, 20:00) | 26 | 93 % |
| Lunch box by Qodec (on 18. August 2020, 11:18) | 29 | 96 % |
| The Devil's Arrow by PotatoHead21 (on 6. June 2021, 06:51) | 18 | 91 % |
| Ghost by Jay Dyer (on 13. April 2022, 15:50) | 26 | 96 % |
| Just Wrogn Enough by lerroyy (on 20. May 2022, 18:23) | 64 | 96 % |
| Thorny Tie (Killer Deconstruction) by Agent (on 12. July 2022, 09:00) | 47 | 99 % |
| Cryptic Coin (Arrow Kropki Sudoku) (ft. Tyrgannus) by Agent (on 9. September 2022, 09:00) | 64 | 98 % |
| Parity Party XXIV, "Fast Times" by glum_hippo (on 30. November 2022, 17:14) | 16 | 98 % |
| Japanese Sums Nurikabe Arrows (9x9) by Xendari (on 1. January 2023, 08:55) | 15 | 95 % |
