(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 | |
|---|---|---|---|
 | Japanese Sums #6: Volatility by Myxo (on 21. March 2024, 10:05) | 31 |  100 % |
| Fahrenheit's Vision by Xenonetix (on 11. July 2022, 22:22) | 45 | 99 % |
| Crypto Japanese Cave with Indexers by KNT (on 20. October 2022, 06:39) | 56 | 100 % |
| Roller Coaster mit Extras 14 by Uhu (on 28. May 2019, 23:14) | 39 | 98 % |
| Carry the Three (two-digit arrow sudoku) by clover (on 30. October 2020, 18:10) | 26 | 98 % |
| Obvious Killer by filuta (on 29. March 2021, 11:31) | 24 | 98 % |
| Broken Mirrors (Anti-king, Little Killer) by emmettcito (on 13. April 2021, 20:56) | 13 | 93 % |
| KIIIocator: Ultimate Kill by starwarigami (on 11. November 2021, 03:16) | 14 | 91 % |
| 1347 by Sktx (on 1. February 2022, 23:43) | 15 | 98 % |
| Wichtel 2021 (8): Ideenklau im Sparmodus by wichtel (on 17. October 2022, 12:02) | 23 | 100 % |
| 6 Puzzles, 6 Modifiers, 6 Digits by tesseralis (on 15. October 2022, 10:31) | 25 | 96 % |
| The Entropy Safe by Mad-Tyas (on 13. February 2023, 07:58) | 40 | 95 % |
| Double? Or Nothing? by 3good5you (on 6. August 2023, 06:07) | 12 | 93 % |
| The False Tautology (Zippular Lines #5) by heliopolix (on 12. February 2024, 21:16) | 12 | 95 % |
| Deconstructing Mysterious Little Killers by Jeet Sampat (on 26. February 2024, 16:07) | 26 | 98 % |
| Vertigo Yajilin #2 by Piatato (on 7. May 2024, 17:47) | 11 | 100 % |
| Landvermessung U-Bahn by KNT (on 27. June 2024, 01:47) | 13 | 100 % |
| Chocona Mall by Jay Dyer (on 16. August 2024, 21:19) | 13 | 91 % |
| Wichtels Rätselsommer 2024 (6): Ein seltsamer Mischmasch by wichtel (on 9. September 2024, 20:23) | 12 | 100 % |
| Shockwaves by Jay Dyer (on 12. November 2022, 20:32) | 63 | 95 % |
