(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 | |
|---|---|---|---|
 | Duet (Overlapping Tetrominous Loop) by the_cogito (on 28. June 2024, 22:34) | 16 |  100 % |
| Projected Cave by KNT (on 10. August 2024, 20:16) | 53 | 97 % |
| Mystery Room Somedoku by blackjackfitz (on 18. August 2024, 15:01) | 39 | 93 % |
| Night on the Galactic Railroad by sfushidahardy (on 19. August 2024, 00:04) | 30 | 96 % |
| U-Bahn with Fillomino enclosures #2 (10x10) by Jesper (on 7. November 2024, 17:49) | 37 | 99 % |
| [TSL][S1T2] Chaotic Journey: Is this .... ? by yttrio (on 28. December 2024, 02:00) | 27 | 95 % |
| Apsidal Precession (Black Hole) by gdc (on 14. October 2025, 04:11) | 45 | 93 % |
| the cost of giving up by aqjhs (on 21. December 2025, 05:05) | 21 | 98 % |
| Nashville by ICHTUES (on 19. June 2022, 06:00) | 80 | 96 % |
| Stingray (Odd) - Numbered rooms+Parity lines Sudoku by Qodec (on 11. January 2023, 23:02) | 66 | 96 % |
| Heads or Tails? by Xenonetix (on 27. July 2022, 15:51) | 42 | 99 % |
| Matrix of Loopy Fireworks by Aspartagcus (on 11. April 2024, 09:38) | 32 | 97 % |
| Japanische Koralle Krypto by Uhu (on 22. January 2017, 16:24) | 47 | 99 % |
| Mehrdeutige Rätsel - Fillomino 2 by uvo (on 1. March 2017, 13:01) | 31 | 92 % |
| The Descent by mathpesto (on 12. October 2022, 03:41) | 28 | 94 % |
| Nurikabe Cousins by Agent (on 22. August 2023, 09:00) | 51 | 98 % |
| Halves and Halve-Nots by ViKingPrime (on 6. December 2024, 21:22) | 26 | 93 % |
| The Trident by GBPack (on 8. March 2022, 20:49) | 47 | 97 % |
| Angel Fish by Blobz (on 29. July 2024, 16:00) | 56 | 92 % |
| Japanische Inseln, Teil 2 by pirx (on 25. February 2014, 18:30) | 58 | 97 % |
