(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 | |
|---|---|---|---|
 | Tree Of Dominos by Jobo (on 11. March 2023, 11:13) | 15 |  92 % |
| Lithium + Neon by 99%Sneaky (on 14. June 2023, 19:58) | 16 | 98 % |
| Diagonal Indexing #1 by EPH (on 5. August 2023, 02:41) | 21 | 92 % |
| Modular Mirror by RockyRoer (on 3. October 2023, 11:52) | 71 | 94 % |
| Edge Effects by arbitrary (on 9. March 2024, 03:50) | 18 | 94 % |
| Propeller by Scojo (on 30. April 2024, 10:53) | 16 | 94 % |
| Mysterious Puzzle Survey by Niverio (on 8. July 2024, 01:00) | 14 | 96 % |
| Psst, I'm in the Loop by Calvinball (on 9. July 2024, 15:15) | 65 | 95 % |
| Kill Or Quads by MSDOS (on 12. July 2024, 08:26) | 72 | 92 % |
| Walking around town (Deconstruction) by Oripy (on 12. May 2025, 12:00) | 49 | 96 % |
| poLo by Mattisahuman (on 21. January 2026, 02:35) | 13 | 90 % |
| Top Right Boi (Numbered Region Chaos Construction) by MaizeGator (on 23. June 2025, 03:57) | 89 | 98 % |
| Whispering Skyscrapers by Florian Wortmann (on 9. January 2022, 13:22) | 44 | 91 % |
| Offset by Nordy (on 11. March 2025, 08:30) | 42 | 93 % |
| Anti-Quads 7 by The Bard (on 1. September 2025, 07:40) | 101 | 95 % |
| Snake Egg Sudoku by Phistomefel (on 31. May 2020, 00:19) | 114 | 98 % |
| Circles and Thermos by stimim (on 9. September 2023, 19:28) | 116 | 96 % |
| Doppel-Killer Sudoku 0/1-9 by julius64 (on 27. January 2011, 22:21) | 46 | 94 % |
| Fish food by Qodec (on 4. December 2020, 23:21) | 53 | 97 % |
| Odd/Even Consecutive Killer 4 by Quarterthru (on 9. January 2021, 12:00) | 24 | 95 % |
