(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 | |
|---|---|---|---|
 | REN-BAN by zegres (on 17. October 2023, 05:50) | 47 |  95 % |
| ∞ Interfering Loops ∞ by ElChiglia (on 18. October 2023, 18:37) | 37 | 97 % |
| The King's Round Table by DubiousMobius (on 29. September 2024, 03:12) | 36 | 93 % |
| Little Killers - But which way? by RockyRoer (on 25. August 2020, 22:39) | 45 | 94 % |
| Shy Evens X Odds Sudoku by ICHTUES (on 7. February 2021, 06:00) | 51 | 95 % |
| I Chased a Polecat Up a Tree (Inequality Series #5) by twototenth (on 5. October 2021, 08:00) | 27 | 93 % |
| Residual X-Rays by FullDeck-Missing (on 18. October 2022, 10:15) | 27 | 90 % |
| Glider Gun [Akari RGB] by wisty (on 13. October 2023, 14:46) | 26 | 90 % |
| Little Killer Around You by Ridhwan (on 19. November 2023, 03:40) | 26 | 94 % |
| Chessmates Sudoku by Genomico (on 30. November 2023, 23:54) | 28 | 91 % |
| Not Just Once by jwsinclair (on 11. January 2024, 21:14) | 98 | 96 % |
| Pentopia by au voleur! (on 14. February 2023, 02:04) | 60 | 91 % |
| Little Irregular Killer 2 by Richard (on 29. August 2012, 12:00) | 73 | 94 % |
| L.O.V.E. to S.O.L.V.E. by mathpesto (on 2. May 2022, 10:22) | 44 | 94 % |
| Suburbs by Nordy (on 11. November 2023, 11:11) | 38 | 93 % |
| Region Sum and Renban lines by psninn (on 27. September 2024, 20:29) | 66 | 90 % |
| LM 2018 Countdown: A 38 (1) by tuace (on 2. June 2018, 09:06) | 41 | 95 % |
| Inselhafen, Teil 3 by pirx (on 20. September 2018, 18:00) | 26 | 98 % |
| Araf's Lunchbox (6x6) by udukos (on 17. June 2021, 21:54) | 12 | 98 % |
| Wanderlust by 10feet (on 5. August 2021, 13:00) | 32 | 92 % |
