(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 | |
|---|---|---|---|
 | Ciphered Japanese Sums - KNT by Niverio (on 22. April 2023, 12:18) | 43 |  99 % |
| A Flock of Pixels (Colourful Killers) by The Book Wyrm (on 27. August 2023, 15:56) | 17 | 98 % |
| Candy Corner (ft. grkles) by Niverio (on 10. November 2023, 18:53) | 37 | 92 % |
| Medusa's Lair by XeonRisq (on 5. April 2024, 20:00) | 20 | 100 % |
| Balanced U-Bahn [Cave U-Bahn] by wisty (on 24. February 2025, 21:06) | 17 | 98 % |
| Big Bad Wolf by IcyFruit (on 10. April 2025, 14:24) | 107 | 98 % |
| Rainy Day Sudoku 12 (squared) & 35 by joecat (on 30. July 2020, 11:20) | 92 | 99 % |
| Obvious Killer by filuta (on 29. March 2021, 11:31) | 34 | 97 % |
| Suguru Chaos Deconstruction: The Mop (Between Lines) by crispy16 (on 26. May 2022, 20:43) | 38 | 97 % |
| Lost City (Lost and Found #7) by .proxz14 (on 26. April 2025, 10:00) | 28 | 93 % |
| The Wandering Boi (Wrap Around, Chaos Construction) by DubiousMobius (on 24. July 2025, 00:38) | 29 | 100 % |
| Chaotic Wrogn [Tribute to DiMono] by Undar_Beyond (on 28. December 2020, 08:14) | 99 | 97 % |
| Palindromic Little Killer X Sudoku by SudokuExplorer (on 23. February 2021, 01:00) | 52 | 95 % |
| Sadism by grkles (on 17. October 2022, 13:05) | 58 | 96 % |
| LM 2017 Reste: Achterbahn (ohne Sicherheitsgurte) by pwahs (on 14. April 2017, 10:00) | 35 | 99 % |
| Syzygy Stardust by David BOWie by mith (on 11. April 2022, 21:48) | 42 | 97 % |
| Double the Heat by Jay Dyer (on 17. September 2022, 21:55) | 38 | 99 % |
| Goliath by Jay Dyer (on 25. July 2023, 16:03) | 39 | 98 % |
| Japanese Japanese Sums Sums #1 by The Book Wyrm (on 30. November 2023, 22:11) | 41 | 98 % |
| Disconnected Counting Chaos by wooferzfg (on 9. June 2024, 05:16) | 37 | 97 % |
