(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 | |
|---|---|---|---|
 | Killoc4tor: Kill List by starwarigami (on 14. November 2021, 03:07) | 29 |  99 % |
| Arrows Anonymous by XeonRisq (on 11. March 2022, 04:00) | 13 | 98 % |
| Pawn's SET Piece (6x6) by mormagli (on 23. October 2022, 02:48) | 16 | 98 % |
| Lighthouse Nurikabe by Gliperal (on 8. February 2023, 20:57) | 15 | 94 % |
| Renber Whispan by Sktx (on 9. July 2023, 18:29) | 35 | 92 % |
| What's in a naname? (Nanameguri/Killer) by dumediat (on 7. September 2023, 22:51) | 16 | 98 % |
| Sega Cages by Prof.Dori (on 31. December 2023, 15:17) | 17 | 96 % |
| Fillmat-doku by yttrio (on 12. January 2024, 21:48) | 42 | 98 % |
| Cosmic Cages by yanggang (on 24. July 2024, 23:20) | 32 | 92 % |
| Arrow Dynamics by PotatoHead21 (on 23. September 2024, 21:35) | 19 | 98 % |
| Decompression [TSL][S1T6] by jwsinclair (on 18. July 2025, 23:22) | 46 | 95 % |
| Life, Uh, Finds a Way by juggler (on 9. September 2025, 00:03) | 50 | 96 % |
| Roller Coaster mit Extras 7 by Uhu (on 25. June 2018, 15:32) | 59 | 97 % |
| Killer Cave by udukos (on 7. October 2021, 06:12) | 59 | 100 % |
| Murder Mystery [Cipher, Little Killer, Look-and-Say Little Killer] by 3good5you (on 13. September 2023, 10:39) | 49 | 96 % |
| Ambiguity (X-Sums/Numbered Rooms) by udukos (on 5. July 2022, 13:25) | 67 | 97 % |
| Thermo + Killer + Anti-Knight by stimim (on 30. July 2020, 17:38) | 101 | 98 % |
| Foghqwhgads by ThePedallingPianist (on 9. February 2023, 23:55) | 69 | 96 % |
| Striped snake (halvers and doublers) by Lizzy01 (on 23. May 2025, 14:06) | 27 | 94 % |
| Colorimetry (Four Color Pentomino Sums) by Agent (on 19. August 2025, 09:00) | 56 | 97 % |
