(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 | |
|---|---|---|---|
 | Antiknight-Killer Sudoku - Fortyfour by X13579 (on 16. June 2020, 10:28) | 61 |  92 % |
| Star Nurikabe N± by BenceJoful (on 2. October 2021, 02:24) | 29 | 94 % |
| Absolute Zero by juggler (on 8. March 2024, 08:24) | 34 | 97 % |
| Portal Hopping by Gerhard1963 (on 13. September 2024, 22:11) | 35 | 92 % |
| Wichtel 2013 (8): Professor Kropkis Zahlenkabinett by wichtel (on 9. April 2014, 12:30) | 72 | 98 % |
| JAMES BOND - Buchstabenrätsel by DocLogic (on 13. January 2020, 18:00) | 39 | 91 % |
| Cageless (X) Killer Sudoku no. 3 by Shinya (on 3. April 2020, 22:10) | 22 | 95 % |
| 真笑Puzzles036--Chaos Construction-- “韩非子” 002 by cdwg2000 (on 27. March 2021, 09:27) | 19 | 93 % |
| Perfect Squares by ICHTUES (on 23. January 2022, 06:00) | 19 | 91 % |
| Six dots by Lutterot (on 18. May 2023, 22:46) | 38 | 91 % |
| Dark Stars by Blobz (on 26. August 2024, 16:00) | 46 | 96 % |
| Loses Kalenderblatt April 2019 (1/2) by April (on 1. April 2019, 00:00) | 28 | 95 % |
| 3’s A Charm - Kropki/Arrow Sudoku by Mr.Menace (on 24. July 2023, 20:46) | 37 | 91 % |
| LM 2024 Leftover: Extra Region U-Bahn by uvo (on 21. June 2024, 12:00) | 28 | 96 % |
| Sandwich-Sudoku mit Average Arrows by glum_hippo (on 18. April 2021, 06:00) | 64 | 100 % |
| Irregular Migraine No7 by TinkerTroy (on 1. May 2023, 03:37) | 39 | 95 % |
| Ring around the rosie by siron2133 (on 20. November 2022, 11:57) | 59 | 97 % |
| Doppelter Rundweg by SilBer (on 4. July 2009, 11:21) | 82 | 95 % |
| Constellation Sudoku by Gliperal (on 29. August 2020, 10:08) | 16 | 93 % |
| Happy Holidays #3: Wassailing by Big Tiger (on 9. December 2020, 00:00) | 17 | 100 % |
