(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 | |
|---|---|---|---|
 | Snake Sum Sudoku 3 by Quarterthru (on 4. July 2020, 00:00) | 29 |  97 % |
| Poisoned Little Killer by SenatorGronk (on 24. September 2020, 04:50) | 14 | 98 % |
| Trigonometry (Killer Sudoku) by emmettcito (on 26. April 2021, 20:04) | 29 | 95 % |
| Even Numbers are Social Distancing by swaroop2012 (on 3. May 2021, 21:15) | 13 | 91 % |
| All Whispers Are Set (German Whispers Sudoku) by Cane_Puzzles (on 16. July 2021, 19:30) | 16 | 93 % |
| Convergence by Stavros96 (on 29. September 2021, 12:02) | 14 | 98 % |
| Reunited by sunnyjum (on 19. February 2022, 10:22) | 14 | 98 % |
| Scatter Plot by Xenonetix (on 14. June 2022, 04:56) | 37 | 98 % |
| [Fog of War Series] 2.Interlinked by AstralSky (on 26. October 2022, 04:36) | 65 | 91 % |
| Ravine by Jay Dyer (on 21. January 2023, 23:55) | 84 | 95 % |
| 27x15 (2 in 1: Fillomino and Killer) by BenTen (on 15. October 2023, 02:10) | 15 | 100 % |
| dOUBLE tHINK by Abdul the Killer (on 9. January 2024, 12:34) | 31 | 93 % |
| Parity Repellant by XeonRisq (on 24. January 2024, 17:00) | 12 | 95 % |
| Yin Yang Whispers by BenTen (on 23. April 2024, 18:50) | 44 | 90 % |
| The devil's modular links by egubachu (on 8. April 2024, 21:58) | 14 | 91 % |
| Squidshoku (Squishdoku, Octopus) by ThePedallingPianist (on 1. May 2024, 00:58) | 13 | 91 % |
| Austrian Whispers by sanabas (on 2. July 2024, 17:34) | 13 | 93 % |
| Separated Pairs by arbitrary (on 13. July 2024, 23:37) | 15 | 98 % |
| Projected Cave by KNT (on 10. August 2024, 20:16) | 40 | 99 % |
| Rogue Knight by JnL (on 2. July 2022, 17:09) | 27 | 91 % |
