(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 Knights Who Say "Negator" by Scojo (on 17. September 2023, 06:41) | 20 |  98 % |
| Regiscissors by Tyrgannus (on 16. July 2021, 00:51) | 47 | 96 % |
| Michael Palin by starwarigami (on 4. April 2022, 21:18) | 52 | 97 % |
| One Set of Killer Arrows by Jolly Rogers (on 7. January 2025, 18:50) | 38 | 94 % |
| Entanglement by Jay Dyer (on 25. July 2024, 16:15) | 230 | 97 % |
| Empty Cages by clover (on 13. August 2020, 21:21) | 34 | 97 % |
| Two-Doku Xtreme by Stavros96 (on 3. October 2020, 03:53) | 16 | 98 % |
| Zero Ambiguity by XeonRisq (on 17. July 2022, 01:00) | 14 | 94 % |
| Arrow Bites by PotatoHead21 (on 30. October 2022, 21:57) | 18 | 98 % |
| 3’s A Charm - Kropki/Arrow Sudoku by Mr.Menace (on 24. July 2023, 20:46) | 40 | 92 % |
| Dark Stars by Blobz (on 26. August 2024, 16:00) | 59 | 96 % |
| Beauty Mark by zetamath (on 24. August 2023, 21:36) | 148 | 94 % |
| AntiknighthginkitnA by tribution (on 4. November 2022, 13:58) | 86 | 92 % |
| The Big Bang by EricRathbun (on 12. June 2023, 14:23) | 33 | 95 % |
| KUBA - Buchstabenrätsel by DocLogic (on 3. January 2020, 21:40) | 44 | 94 % |
| Rainbow Bricks by tsc (on 2. September 2022, 23:14) | 68 | 95 % |
| The Bald Eagle by LKegel (on 6. February 2021, 11:42) | 33 | 91 % |
| Reversion to the Mean (Regression zur Mitte) by cristophermoore (on 20. March 2021, 23:24) | 16 | 93 % |
| Shoot the Pears by tallcat (on 9. April 2021, 15:50) | 43 | 96 % |
| Primescraper: Skysweeper by grkles (on 12. April 2021, 20:49) | 27 | 94 % |
