(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 | |
|---|---|---|---|
 | Regular Tetragons by Oddlyeven (on 18. July 2022, 02:04) | 19 |  92 % |
| Floody Hekc by Malrog (on 30. July 2022, 01:38) | 14 | 98 % |
| ADVENTSKALENDER - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. December 2022, 14:35) | 31 | 95 % |
| X-Lines Sudoku by dennischen (on 19. February 2023, 20:21) | 15 | 92 % |
| Nothing's Funny (XV, Killer, Renban) by Chefofdeath (on 15. June 2023, 20:47) | 37 | 94 % |
| Find and Take Out The Killers by RockyRoer (on 19. September 2023, 03:17) | 47 | 97 % |
| Hedge Maze by dennischen (on 20. May 2024, 10:10) | 30 | 91 % |
| Twister by Prof.Dori (on 22. May 2024, 14:06) | 49 | 91 % |
| Ratsnake (Loop/German Whispers/Parity/X Sums) by damo_89 (on 19. August 2024, 13:06) | 15 | 92 % |
| [TSL][S1T1] Red is innocent by ademjaz (on 13. October 2024, 18:00) | 13 | 92 % |
| Octavia by steelwool (on 20. October 2024, 20:43) | 16 | 90 % |
| Corner Pockets by thoughtbyte (on 6. September 2022, 21:07) | 74 | 95 % |
| DSM Qualitraining 2021: Parity Party Sudoku by Realshaggy (on 16. January 2021, 06:00) | 52 | 96 % |
| Median Killer Sudoku by RockyRoer (on 11. June 2021, 14:00) | 51 | 98 % |
| Japanische Summen - Krypto by ibag (on 22. July 2012, 09:20) | 81 | 99 % |
| SPION-AGENT-KUNDSCHAFTER Buchstabenrätsel by DocLogic (on 16. March 2021, 14:14) | 36 | 97 % |
| Loop Pentominous by Jay Dyer (on 7. March 2022, 21:43) | 38 | 96 % |
| Black-dot Mamba by yttrio (on 10. November 2023, 20:55) | 89 | 98 % |
| Happy birthday, pin7guin by ibag (on 6. September 2011, 00:00) | 42 | 91 % |
| Differenz X Chaos Sudoku by tuace (on 17. December 2016, 11:03) | 43 | 96 % |
