(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 | |
|---|---|---|---|
 | The Taste of Entropy by Mad-Tyas (on 10. September 2024, 05:35) | 41 |  93 % |
| Nonconsecutive Renban by Phistomefel (on 9. February 2022, 20:46) | 120 | 97 % |
| Japanische Höhle vom Hein mit Hilfe vom Irrwisch by ibag (on 27. March 2020, 00:00) | 32 | 99 % |
| Cryptic Kropki Sudoku by Greg (on 25. July 2020, 22:01) | 38 | 98 % |
| COCKTAIL - Buchstabenrätsel / Letter Puzzle by DocLogic (on 26. August 2022, 13:55) | 34 | 94 % |
| Sumro by Myxo (on 25. May 2023, 15:49) | 40 | 99 % |
| Border Square Sums by Phistomefel (on 15. March 2024, 05:49) | 121 | 98 % |
| Inside by zetamath (on 13. October 2024, 19:05) | 82 | 96 % |
| Zwei Rundwege by Calavera (on 30. July 2009, 15:14) | 76 | 98 % |
| Medieval Upheaval by Nordy (on 2. July 2022, 08:00) | 84 | 98 % |
| Anti-7 Arrows by ademjaz (on 31. January 2024, 09:25) | 43 | 95 % |
| Pathological by arbitrary (on 7. June 2024, 12:52) | 40 | 91 % |
| Regicide by NicoD (on 26. June 2025, 05:30) | 45 | 94 % |
| Basket by Jay Dyer (on 10. October 2024, 23:37) | 130 | 98 % |
| Flaemmchen-Sudoku mit Einmischung der Außerirdischen by ibag (on 2. August 2013, 05:30) | 36 | 98 % |
| Paintball battle by Joseph nehme (on 26. December 2020, 18:04) | 44 | 96 % |
| Effective Field Theory by purpl (on 28. September 2021, 02:18) | 42 | 98 % |
| RPG - The Enigma Trio by Playmaker6174 (on 24. December 2021, 16:30) | 41 | 96 % |
| Kropki Chaos by mathpesto (on 23. January 2022, 04:19) | 84 | 97 % |
| Red Square Blue Square by marty_sears (on 7. June 2023, 17:29) | 87 | 97 % |
