(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 | |
|---|---|---|---|
 | Chaotic X-Sums by Florian Wortmann (on 6. September 2023, 18:09) | 115 |  97 % |
| Parity Runs #4: Odd Island by Madmahogany (on 12. June 2020, 23:30) | 32 | 93 % |
| Little Killer Sudoku by Philipp Huber (on 5. July 2020, 13:02) | 34 | 90 % |
| Zodiac Project: Cage Decoder by sujoyku (on 12. June 2024, 23:06) | 68 | 94 % |
| Wichtel 2018 (5): Japanische U-Bahn by wichtel (on 29. November 2019, 02:18) | 41 | 99 % |
| Little Killer Sudoku #3 by Phistomefel (on 12. September 2020, 11:05) | 59 | 93 % |
| Sandwiches for Table Four by RockyRoer (on 22. March 2023, 10:25) | 59 | 96 % |
| Modular Mirror by RockyRoer (on 3. October 2023, 11:52) | 68 | 95 % |
| Sumthing by ThePedallingPianist (on 7. December 2023, 07:33) | 65 | 95 % |
| Crossbow (Arrow variant sudoku) by Qodec (on 10. July 2024, 15:34) | 61 | 95 % |
| Gebietsprodukte mit Null (III v. III) by Luigi (on 29. April 2010, 17:48) | 48 | 94 % |
| Differenz X Kakuro IV (kryptisch) by tuace (on 31. August 2014, 21:30) | 39 | 97 % |
| Murder on the Orient Express - killer sudoku by KevinCelis (on 18. July 2020, 00:07) | 14 | 95 % |
| Pentominous + Killer Sudoku by mandourin (on 2. October 2020, 23:48) | 15 | 98 % |
| X-Distance Sudoku(2)——Hard by cdwg2000 (on 18. November 2020, 16:47) | 26 | 92 % |
| Four Killer Winds by Franjo (on 24. May 2021, 18:49) | 13 | 95 % |
| 159 with 234678 by panthchesh (on 19. September 2021, 01:14) | 36 | 90 % |
| Smörgåsbord by Qodec (on 2. November 2021, 23:17) | 53 | 95 % |
| Forked by Emphyrio (on 11. April 2022, 17:57) | 16 | 98 % |
| Übungsrätsel für die LM 2022: Bewegung bitte! by lupo (on 17. June 2022, 12:00) | 13 | 98 % |
