(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 | |
|---|---|---|---|
 | Suspension of Disbelief by XeonRisq (on 27. June 2022, 17:00) | 56 |  97 % |
| Et Tu Brute? by Scojo (on 19. March 2024, 14:04) | 50 | 95 % |
| Killer Sudoku - Ignorant of 9's by ProwlingTiger (on 10. May 2020, 00:49) | 45 | 94 % |
| The Suducku King (Thermometer + Renban sudoku) by Aspartagcus (on 1. May 2021, 20:51) | 45 | 94 % |
| Chaotic Sandwiches (Entropy Special) by Mad-Tyas (on 2. January 2022, 21:29) | 45 | 96 % |
| Bergentrückung by Gerhard1963 (on 10. October 2024, 23:00) | 44 | 90 % |
| Gigglywhirl (Nabner Whisper) by tallcat (on 4. January 2025, 16:08) | 88 | 96 % |
| Erster Pfeilchenstrauß by glum_hippo (on 16. August 2020, 09:33) | 44 | 95 % |
| Nonconsecutive Quads by LucyAudrin (on 24. July 2021, 20:18) | 48 | 91 % |
| Insight by Xenonetix (on 15. January 2022, 04:54) | 37 | 96 % |
| Region X-Sums by twototenth (on 4. October 2022, 08:00) | 41 | 92 % |
| all the seats were occupied by aqjhs (on 15. December 2025, 17:17) | 41 | 94 % |
| Wail by mathpesto (on 25. February 2025, 17:26) | 81 | 95 % |
| Ausgedehnte Mittagspause by Richard (on 26. February 2010, 12:00) | 68 | 97 % |
| "21" Partial Killer by Djmelee3000 (on 17. September 2020, 22:31) | 42 | 95 % |
| Chaos Construction: Snake by Jay Dyer (on 14. January 2022, 19:55) | 34 | 98 % |
| In The Middle of The Knight by Ridhwan (on 30. March 2023, 09:00) | 40 | 92 % |
| Squishtroquadri Snack Pack by ThePedallingPianist (on 5. December 2024, 12:25) | 38 | 95 % |
| 真笑Puzzles038--Chaos Construction-- “韩非子” 003 by cdwg2000 (on 6. April 2021, 14:18) | 30 | 98 % |
| 159² by Sktx (on 2. September 2021, 01:17) | 28 | 94 % |
