(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 | |
|---|---|---|---|
 | Subway Buddies by Niverio (on 9. August 2024, 13:03) | 29 |  97 % |
| Chaos Construction - Border Relations by Niverio (on 3. May 2024, 12:35) | 92 | 97 % |
| Pentominous Killer Kakuro by Agent (on 10. February 2024, 09:00) | 94 | 99 % |
| Zeeta-Moth by 99%Sneaky (on 5. June 2024, 18:25) | 70 | 94 % |
| Between Knights and Arrows by Phistomefel (on 21. February 2021, 12:22) | 113 | 95 % |
| Bunte Geburtstagstorte by Luigi (on 4. November 2014, 00:56) | 31 | 96 % |
| RGB by Qodec (on 11. September 2021, 14:17) | 79 | 97 % |
| Meidjuluk Star Battle by Grausbert (on 19. June 2023, 15:30) | 19 | 95 % |
| Cryptic Lunchboxes by Undar_Beyond (on 20. June 2020, 17:58) | 49 | 99 % |
| Unresolved Differences by Scruffamudda (on 29. March 2023, 05:47) | 30 | 94 % |
| Adventskalender 2020, Türchen 23 - Kerzen by Zzzyxas (on 23. December 2020, 07:00) | 47 | 90 % |
| Little Whisper Nightmares by LittleNightmaresLady (on 1. April 2023, 19:24) | 21 | 90 % |
| Kreuzfahrt by pirx (on 14. April 2018, 18:00) | 34 | 99 % |
| Sigma Pi by IcyFruit (on 7. December 2023, 21:50) | 90 | 94 % |
| The Four Pyramids by EricRathbun (on 10. December 2022, 23:03) | 52 | 96 % |
| Kropki squared sudoku #1 by Nylimb (on 20. September 2020, 07:45) | 12 | 93 % |
| Odd/Even Killer Sudoku (#4) - No given cage totals by Mr.Menace (on 30. November 2020, 22:25) | 14 | 95 % |
| Arrows and Dots by kolot (on 21. August 2021, 13:12) | 42 | 94 % |
| Sudokabe [Nurikabe Deconstruction] by Christounet (on 20. March 2024, 12:08) | 38 | 98 % |
| How does this even work? - Odd/Even Killer sudoku by Mr.Menace (on 28. May 2024, 20:45) | 15 | 91 % |
