(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 | |
|---|---|---|---|
 | Archer's Gate by SudokuExplorer (on 20. July 2021, 02:00) | 62 |  97 % |
| Catch the fish (Arrows) by abed hawila (on 12. April 2021, 12:05) | 27 | 95 % |
| Cithara by BIGfoot (on 2. November 2021, 15:38) | 30 | 91 % |
| Xandwich by Qodec (on 4. January 2022, 01:14) | 54 | 96 % |
| Chaos Construction: 2nd Region X-Sums #1 (8x8) by Jesper (on 3. April 2022, 16:03) | 79 | 100 % |
| Hungry Hungry Renbans by sunnyjum (on 30. October 2022, 15:31) | 26 | 97 % |
| Knight's XV by Scruffamudda (on 25. April 2023, 22:38) | 28 | 94 % |
| Boulder (Fillomino/Heyawake) by mathpesto (on 29. April 2023, 16:15) | 59 | 94 % |
| X---V by NurglesGift (on 16. March 2025, 09:41) | 97 | 96 % |
| By the Sword by boozledorf (on 30. March 2025, 07:16) | 33 | 92 % |
| Chaconopia Whirlwind by Mad-Tyas (on 8. September 2025, 12:55) | 26 | 99 % |
| One arrow comes to the rescue (Anti-Knight Shading) by galium_odoratum (on 2. December 2025, 20:03) | 28 | 98 % |
| Ambiguity by zetamath (on 8. April 2021, 01:48) | 82 | 97 % |
| UFO (RSL, Entropy) by Mad-Tyas (on 4. November 2024, 00:09) | 86 | 93 % |
| Violet Owl by Tyrgannus (on 18. January 2022, 17:06) | 50 | 95 % |
| Monsoon by heliopolix (on 9. November 2023, 00:08) | 56 | 96 % |
| Copycat Collaboration by Scojo (on 28. June 2024, 13:38) | 64 | 99 % |
| Auteur by SamuPiano (on 14. August 2024, 15:44) | 53 | 98 % |
| Chaos Windoku IV by Richard (on 7. May 2010, 12:00) | 85 | 90 % |
| Palindrome Killer 101 by Cane_Puzzles (on 8. August 2021, 19:01) | 28 | 92 % |
