(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 | |
|---|---|---|---|
 | Send In The Clones by Jay Dyer (on 25. September 2024, 23:03) | 32 |  93 % |
| overflow underway by aqjhs (on 9. January 2025, 05:05) | 29 | 91 % |
| Skycagers (Build Your Own Killer Sudoku) by Agent (on 17. January 2023, 09:00) | 80 | 99 % |
| Poison Pill Killer by JeffWajes (on 4. September 2023, 20:30) | 45 | 96 % |
| So Very Wrogn by tallcat (on 20. June 2023, 08:00) | 62 | 91 % |
| Wichtel 2017 (10): Luftige Flotte an Wolkenmousse in inversem Schneegestöber by wichtel (on 17. October 2018, 07:04) | 24 | 99 % |
| A Bridge Before the Rainbow by fritzdis (on 20. March 2021, 21:35) | 13 | 93 % |
| Xycle by ICHTUES (on 4. September 2022, 06:00) | 13 | 90 % |
| The Digits Are Paid Actors by Lizzy01 (on 5. November 2022, 21:40) | 26 | 99 % |
| A Narrow Region by PotatoHead21 (on 21. February 2023, 20:25) | 13 | 95 % |
| Unlucky Sevens by noswald (on 7. June 2023, 04:52) | 44 | 94 % |
| Eclipsed Whispers by Space_man (on 7. May 2024, 05:52) | 39 | 95 % |
| U-Bahn with Extra Regions by wooferzfg (on 2. July 2024, 07:46) | 26 | 100 % |
| Chaos Incorporated by Kafkapharnaum (on 4. April 2025, 01:23) | 28 | 100 % |
| Convergence by TotallyNormalCat (on 18. February 2021, 22:30) | 31 | 98 % |
| Unboxing by mathpesto (on 11. May 2023, 05:11) | 68 | 97 % |
| Reef by zetamath (on 26. June 2023, 03:35) | 120 | 97 % |
| The Landmark of Entropia by Mad-Tyas (on 30. March 2024, 09:11) | 35 | 93 % |
| Sunset Cave by wooferzfg (on 4. May 2025, 08:37) | 37 | 96 % |
| Productivity Killer (BYOK+) by SeveNateNine (on 18. October 2023, 02:45) | 58 | 95 % |
