(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 | |
|---|---|---|---|
 | I Want More Clues by EricRathbun (on 8. April 2023, 23:12) | 22 |  96 % |
| Misty Mountain Hop by kuraban (on 12. March 2024, 20:59) | 59 | 94 % |
| Gouge Away by mathpesto (on 7. April 2024, 17:31) | 148 | 98 % |
| Muddlebug by Tyrgannus (on 17. June 2024, 09:12) | 41 | 95 % |
| Misshapen Skyscrapers by Belamis (on 19. June 2024, 21:20) | 19 | 94 % |
| Close Enough by MSDOS (on 3. August 2024, 05:51) | 22 | 91 % |
| Entropic Tens by ebiggie (on 12. March 2025, 00:04) | 21 | 91 % |
| The Fantastic Four by oskode (on 19. May 2025, 06:23) | 129 | 97 % |
| Arrows of War by DubiousMobius (on 22. July 2025, 01:03) | 24 | 98 % |
| Intereference by ChinStrap (on 10. September 2025, 20:20) | 34 | 96 % |
| [New Modifier Variant] Fire and Water by Mad-Tyas (on 3. February 2026, 16:02) | 35 | 96 % |
| Swiss Cheese (Black Hole) by gdc (on 23. April 2026, 14:05) | 22 | 100 % |
| Eiskalte Magnetplatten by berni (on 16. December 2008, 22:28) | 109 | 95 % |
| Douro by Xenonetix (on 12. March 2026, 23:32) | 124 | 95 % |
| Anti-Fortress Arrow Sudoku by Phistomefel (on 17. January 2021, 21:52) | 96 | 93 % |
| Glatt by ICHTUES (on 23. October 2022, 06:00) | 54 | 95 % |
| Nothing is Wrogn by Jay Dyer (on 20. November 2022, 19:49) | 137 | 96 % |
| Magic Clone Knight Sudoku by Rotstein (on 27. May 2020, 01:04) | 35 | 92 % |
| Windmill by FryTheGuy (on 4. October 2021, 21:26) | 31 | 96 % |
| Aquarium Escape by zegres (on 6. January 2022, 19:58) | 29 | 92 % |
