(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 | |
|---|---|---|---|
 | Constantinoqle (V-Bbhn witg Nestimg Ckues) by sfushidahardy (on 27. August 2025, 18:54) | 13 |  100 % |
| Chaos Construction: Miracle on 81 Cells by Playmaker6174 (on 17. September 2025, 07:00) | 39 | 98 % |
| Whimsical Fillomino Regions by Justalilguy (on 3. January 2026, 10:59) | 12 | 95 % |
| Extended Full Rank by Andrewsarchus (on 3. March 2026, 17:25) | 22 | 94 % |
| Arrow/Group Sum Sudoku by ahaupt (on 10. July 2020, 21:53) | 67 | 99 % |
| Wichtel 2012 (1): Der verwirrte Weihnachtsmann by wichtel (on 18. March 2013, 21:30) | 42 | 99 % |
| Pentominous U-Bahn by KNT (on 17. November 2024, 02:15) | 47 | 95 % |
| Sandwich Sudoku by kolot (on 15. July 2021, 18:33) | 36 | 96 % |
| U-Bahn under Tripleblock for polar by KNT (on 1. January 2024, 08:23) | 32 | 97 % |
| Subway To Hell by Piatato (on 27. January 2024, 15:45) | 33 | 100 % |
| Misfits by filuta (on 10. November 2022, 17:30) | 41 | 99 % |
| Entropia (Skyscraper, Entropy) by Mad-Tyas (on 16. January 2023, 12:15) | 53 | 91 % |
| Trapped by a Killer by SudokuExplorer (on 25. November 2021, 00:00) | 63 | 96 % |
| Japanese Dominos by KNT (on 14. March 2024, 15:59) | 56 | 99 % |
| Hysteria (Chaos Construction) by ThePedallingPianist (on 14. April 2024, 04:56) | 57 | 97 % |
| Triple Japasu IV - Pin7guins nightmare by Luigi (on 23. May 2018, 09:22) | 29 | 95 % |
| Mission Improbable by XeonRisq (on 5. August 2023, 17:00) | 30 | 98 % |
| Japanese Forest Walk (2) by KNT (on 13. November 2025, 15:18) | 37 | 98 % |
| This Thing [Antiknight Series] by wisty (on 10. December 2024, 22:23) | 47 | 97 % |
| Liar Japanese Sums #5 - Ciphered Cave by Niverio (on 11. February 2023, 11:40) | 55 | 99 % |
