(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 | |
|---|---|---|---|
 | Loop Aquarium by wooferzfg (on 23. October 2022, 20:25) | 46 |  96 % |
| Bushido (Star Battle Japanese Sums Fillomino) by Agent (on 6. December 2022, 09:00) | 49 | 99 % |
| Japanische Höhle vom Hein mit Hilfe vom Irrwisch (2) by ibag (on 20. April 2020, 00:00) | 29 | 100 % |
| Cryptic Skyscrapers (Alphabet Soup) by emmettcito (on 21. March 2021, 00:30) | 36 | 98 % |
| Counting Dimensions by Fenners (on 5. July 2025, 07:08) | 39 | 92 % |
| ArrowThermoEntropy by Mad-Tyas (on 30. July 2025, 15:39) | 51 | 91 % |
| 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) | 15 | 98 % |
| Everything in its Right Place by marty_sears (on 16. October 2023, 01:53) | 113 | 99 % |
| Cosmic Cages by yanggang (on 24. July 2024, 23:20) | 32 | 92 % |
| Arrow Dynamics by PotatoHead21 (on 23. September 2024, 21:35) | 19 | 98 % |
| Skygangers by bodemeister (on 26. July 2025, 02:42) | 15 | 94 % |
| Cave Sums Sudoku by Christounet (on 2. January 2026, 20:39) | 28 | 98 % |
| 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 % |
