(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 | |
|---|---|---|---|
 | Azulejos by ndsurgenor (on 15. March 2022, 14:42) | 37 |  96 % |
| The Knight and the Knave (Legit/Liar Sudoku) by mathpesto (on 16. August 2022, 23:13) | 82 | 97 % |
| Chaos Fillomino - Border Gaps #1 by Mark Sweep (on 7. December 2022, 10:00) | 38 | 99 % |
| A Killer Palindrome Sudoku by by81996672 (on 26. December 2023, 08:35) | 39 | 93 % |
| Prison Negativity by Prof.Dori (on 30. January 2024, 18:54) | 21 | 90 % |
| Absolute Zero by juggler (on 8. March 2024, 08:24) | 48 | 94 % |
| Dishes Washed by timotab (on 25. May 2024, 15:59) | 57 | 91 % |
| Raspberry Cream by pieguy (on 6. March 2025, 23:27) | 23 | 93 % |
| Irregular Killer Sudoku 4 by Azure (on 14. April 2025, 15:18) | 41 | 91 % |
| Manta by IcyFruit (on 1. May 2025, 14:01) | 112 | 97 % |
| Losing Luck by AParliamentofOwls (on 30. October 2025, 20:35) | 23 | 94 % |
| Entropy miracle 10 by fractalminding (on 4. April 2026, 09:50) | 29 | 90 % |
| J.O.E. by JayForty (on 7. February 2024, 14:42) | 85 | 97 % |
| Loop Compass by Agent (on 9. April 2024, 09:00) | 67 | 100 % |
| Musical Renban by Mayamor (on 20. April 2023, 14:30) | 54 | 95 % |
| All the Arrows, Big and Small by bboom (on 24. October 2024, 10:06) | 53 | 95 % |
| Squeez Theorem (Suguru Deconstruction) by KevinTheMH (on 28. June 2023, 21:33) | 36 | 93 % |
| Japanische Summen mit Rundweg by Uhu (on 14. September 2017, 15:52) | 54 | 98 % |
| Dallas by ICHTUES (on 10. October 2021, 06:00) | 89 | 96 % |
| Little Killers - But which way? by RockyRoer (on 25. August 2020, 22:39) | 45 | 94 % |
