(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 | |
|---|---|---|---|
 | Dark Stars by Blobz (on 26. August 2024, 16:00) | 87 |  95 % |
| Medley by Playmaker6174 (on 2. September 2024, 08:00) | 71 | 94 % |
| 3D Chaos by mathpesto (on 11. April 2022, 00:20) | 42 | 97 % |
| Branches (arrow sudoku) by Aspartagcus (on 12. September 2023, 13:44) | 67 | 94 % |
| Anti-Kropki Cages by marty_sears (on 7. August 2025, 07:31) | 181 | 97 % |
| Combi Windoku by Richard (on 23. July 2009, 09:57) | 117 | 91 % |
| Ameisenstrasse by Luigi (on 6. May 2011, 12:16) | 22 | 92 % |
| Cube by DVFrank (on 23. June 2021, 18:34) | 42 | 97 % |
| Where's my sandwich? (Sandwich, Numbered Rooms, Kropki) by Chilly (on 19. June 2023, 17:36) | 23 | 92 % |
| Central Difference Method by JMoat13 (on 25. August 2023, 23:06) | 52 | 92 % |
| Trisection by Andrewsarchus (on 16. July 2024, 06:27) | 24 | 93 % |
| The Voice of the Masked Idol who has Got Talent by Morisenseiisgod (on 2. September 2024, 14:01) | 28 | 91 % |
| Portal Hopping by Gerhard1963 (on 13. September 2024, 22:11) | 57 | 95 % |
| Mobile Skyscrapers by juddimal (on 22. March 2025, 17:05) | 23 | 95 % |
| What are the sums? by Benji1810 (on 26. March 2025, 20:50) | 26 | 92 % |
| Only Thermos by Mesmer (on 20. October 2021, 18:10) | 49 | 94 % |
| Symmetrien 7 by julius64 (on 25. June 2011, 00:07) | 71 | 95 % |
| Looping Chaos by Paletron (on 12. March 2024, 20:44) | 78 | 95 % |
| Shy Evens X Odds Sudoku by ICHTUES (on 7. February 2021, 06:00) | 54 | 96 % |
| Arr Arr (Doubler Arrow) by ICHTUES (on 14. August 2022, 06:00) | 58 | 97 % |
