(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 | |
|---|---|---|---|
 | Pseudo Differences by marty_sears (on 20. February 2024, 21:00) | 107 |  98 % |
| Heated Entropic Loop by yttrio (on 23. February 2024, 20:12) | 65 | 97 % |
| Anomaly by Migu (on 12. April 2024, 22:47) | 21 | 93 % |
| Croque Madame by Black_Doom (on 14. April 2024, 17:07) | 28 | 96 % |
| Wish You Were Here by Abdul the Killer (on 23. April 2024, 12:34) | 70 | 93 % |
| Parity Lines Sandwich by RockyRoer (on 29. April 2024, 03:41) | 17 | 92 % |
| Negative Energy by Black_Doom (on 14. July 2024, 07:34) | 56 | 98 % |
| Duplicitous Dots by MSDOS (on 9. August 2024, 20:06) | 14 | 91 % |
| Modular Mid-Loop by yttrio (on 5. October 2024, 01:48) | 46 | 94 % |
| Activate Your Renbans! by RockyRoer (on 2. November 2024, 15:44) | 18 | 93 % |
| 10 out of 10 by burgermason (on 8. December 2024, 10:00) | 36 | 93 % |
| Rorschach by zetamath (on 12. November 2024, 16:42) | 94 | 95 % |
| Seven cats by psninn (on 30. January 2025, 07:50) | 28 | 91 % |
| The short akari canal by damasosos92 (on 24. February 2025, 18:43) | 14 | 98 % |
| Dama's Warning by Donatello_86 (on 19. May 2025, 04:48) | 12 | 100 % |
| Loop in Tension by Oddlyeven (on 21. July 2025, 16:39) | 26 | 91 % |
| Eternal escalation by NicoD (on 4. August 2025, 05:30) | 98 | 96 % |
| The Warden's Sudoku by Elytron (on 1. January 2026, 00:05) | 28 | 93 % |
| Interphase (Cave/Nurikabe/Pentominoes) by dumediat (on 8. January 2026, 02:57) | 38 | 94 % |
 | Signposts by Blobz (on 20. May 2026, 16:00) | 50 | 94 % |
