(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 | |
|---|---|---|---|
 | Greedy Cages Sudoku by Phistomefel (on 3. May 2022, 22:41) | 63 |  99 % |
| Crypto Japanese Twilight Cave by KNT (on 23. October 2022, 06:02) | 48 | 99 % |
| Nabner Doubledeal by Jay Dyer (on 20. September 2023, 13:35) | 49 | 96 % |
| Grid Dancing by Bremster (on 4. June 2022, 05:52) | 48 | 98 % |
| Fillomino: Cryptic Differences #2 by Niverio (on 1. October 2022, 17:49) | 40 | 100 % |
| TENtropy by Mad-Tyas (on 9. May 2023, 09:02) | 42 | 95 % |
| Chaos Deconstruction: Double Snake by KNT (on 25. July 2022, 03:25) | 36 | 97 % |
| Ausgrabungen in Limcastregos by Luigi (on 25. August 2017, 11:43) | 26 | 92 % |
| Pitchfork Emporium by FryTheGuy (on 21. December 2021, 04:10) | 26 | 95 % |
| Bharatanatyam (2T1L CC) by Xenonetix (on 13. August 2022, 00:22) | 27 | 96 % |
| Locomotive by wooferzfg (on 20. July 2023, 20:28) | 28 | 100 % |
| Rivers and Islands Fillomino by Jesper (on 19. October 2020, 10:04) | 44 | 100 % |
| Verzwicktes ABCtje by ibag (on 23. October 2011, 09:42) | 21 | 93 % |
| Arrow Sudoku - The Nightmare by emmettcito (on 19. January 2021, 20:36) | 26 | 97 % |
| Ninelives [X-Sums Chaos Construction] by Panthera (on 22. June 2021, 19:30) | 19 | 100 % |
| On Repeat by mathpesto (on 14. March 2022, 01:14) | 55 | 100 % |
| Chaos Construction: Liars (8x8) by Gliperal (on 22. April 2024, 20:38) | 19 | 93 % |
| Rivers and Islands Sudoku #2 (hard) by matt383 (on 27. May 2020, 14:12) | 37 | 96 % |
| Crypto Japanese Cave with Three Extraterrestrials by KNT (on 21. February 2023, 04:18) | 30 | 100 % |
| Chaos Deconstruction: Sightlines by KNT (on 11. June 2023, 00:07) | 75 | 98 % |
