(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 | |
|---|---|---|---|
 | Chasm Construction by AFrayedKnot (on 23. May 2024, 22:35) | 122 |  98 % |
| Nurimisaki Killer by Jay Dyer (on 27. March 2023, 18:51) | 62 | 98 % |
| Matroschka, grosse Version by pirx (on 5. February 2016, 18:00) | 45 | 97 % |
| Tag 24 - Finale by CJK (on 20. February 2021, 14:48) | 51 | 95 % |
| Bamboozled by NicoD (on 26. February 2025, 05:34) | 43 | 96 % |
| Rectangle Sums by FIT7Y (on 15. March 2026, 00:00) | 40 | 93 % |
| Quadratum by Xenonetix (on 23. July 2022, 22:22) | 54 | 99 % |
| Wichtel 2018 (2): Schnorchelreise by wichtel (on 6. June 2019, 10:28) | 35 | 99 % |
| Die Kryptos - S04E03: Roller Coaster by tuace (on 21. January 2020, 08:06) | 55 | 99 % |
| . o T o . by Lisztes (on 30. June 2021, 01:00) | 21 | 92 % |
| Chaos Construction: X-Sums with Doublers by KNT (on 30. August 2022, 22:01) | 77 | 96 % |
| Benefactors by Andrewsarchus (on 10. September 2022, 07:31) | 18 | 98 % |
| Symphony (Entropy Killer) by Mad-Tyas (on 6. February 2023, 08:28) | 41 | 96 % |
| Wheel of Fortune (Entropy) by Mad-Tyas (on 26. September 2023, 12:52) | 81 | 96 % |
| Origin (Coordinate arrows/Negators) by dumediat (on 21. October 2023, 16:10) | 20 | 100 % |
| All-ternating by MonsieurTRISTE (on 13. August 2025, 10:38) | 20 | 97 % |
| Philadelphia by ICHTUES (on 28. November 2021, 06:00) | 47 | 95 % |
| Crypto Crypto Japanese Cave by KNT (on 29. December 2022, 18:27) | 43 | 99 % |
| Loses Kalenderblatt April 2020 by April (on 1. April 2020, 00:00) | 21 | 94 % |
| Little Killer Arrow Sudoku by Phistomefel (on 2. March 2021, 11:50) | 77 | 97 % |
