(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 | |
|---|---|---|---|
 | Ten Knights by FryTheGuy (on 20. August 2021, 08:16) | 137 |  97 % |
| Chasm Construction by AFrayedKnot (on 23. May 2024, 22:35) | 122 | 98 % |
| Matroschka, grosse Version by pirx (on 5. February 2016, 18:00) | 45 | 97 % |
| Tapa / Islands / Narrow Cave Permaculture by KNT (on 3. July 2024, 02:40) | 36 | 96 % |
| Chaos Construction: Exclusions by KNT (on 1. May 2024, 18:08) | 136 | 92 % |
| 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 % |
| Wichtel 2021 (7): In der Weihnachtsbäckerei by wichtel (on 4. October 2022, 21:02) | 17 | 100 % |
| My cup runneth over intensely by Fool on Hill (on 19. August 2022, 13:29) | 25 | 95 % |
| Benefactors by Andrewsarchus (on 10. September 2022, 07:31) | 18 | 98 % |
| Origin (Coordinate arrows/Negators) by dumediat (on 21. October 2023, 16:10) | 20 | 100 % |
| Doubler Chaos (Chaos Construction) by Mad-Tyas (on 19. November 2024, 23:39) | 135 | 96 % |
| All-ternating by MonsieurTRISTE (on 13. August 2025, 10:38) | 20 | 97 % |
| Keep Talking [And No One Explodes] by zetamath (on 27. December 2021, 20:54) | 101 | 97 % |
| Shade Your Own Puzzle: YinYang vs Sudoku #1 by Playmaker6174 (on 20. August 2024, 19:00) | 62 | 97 % |
| Philadelphia by ICHTUES (on 28. November 2021, 06:00) | 47 | 95 % |
| 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) | 76 | 97 % |
