(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 | |
|---|---|---|---|
 | Watermill by lerroyy (on 15. May 2022, 22:44) | 29 |  97 % |
| Knot in the Crosshairs by antiknight (on 13. December 2022, 23:40) | 30 | 95 % |
| Liar U-Bahn by Myxo (on 8. June 2023, 12:47) | 37 | 99 % |
| Make Room by Jay Dyer (on 5. July 2023, 00:36) | 31 | 97 % |
| Candy Corner (ft. grkles) by Niverio (on 10. November 2023, 18:53) | 37 | 92 % |
| Double Loop Japanese Sums by Agent (on 26. February 2024, 09:00) | 31 | 96 % |
| Medusa's Lair by XeonRisq (on 5. April 2024, 20:00) | 20 | 100 % |
| 1-N Chaos Deconstruction: Whisper / Renban / Between by KNT (on 14. May 2022, 16:49) | 55 | 95 % |
| Ciphered Japanese Sums - KNT by Niverio (on 22. April 2023, 12:18) | 42 | 99 % |
| Obvious Killer by filuta (on 29. March 2021, 11:31) | 34 | 97 % |
| Suguru Chaos Deconstruction: The Mop (Between Lines) by crispy16 (on 26. May 2022, 20:43) | 35 | 97 % |
| Rock and a Hard Place (Chaos Construction) by tallcat (on 15. March 2023, 09:00) | 82 | 96 % |
| Summation U-Bahn #4: Skyscrapers by Agent (on 30. September 2024, 09:00) | 36 | 100 % |
| Steel Vengeance (Chaos Deconstruction Rollercoaster) by tallcat (on 2. September 2024, 08:00) | 54 | 97 % |
| Uncopyrightable Cavino by PrimeWeasel (on 5. September 2024, 22:48) | 29 | 100 % |
| Lost City (Lost and Found #7) by .proxz14 (on 26. April 2025, 10:00) | 28 | 93 % |
| Janus (Chiaroscuro + U-Bahn) by sfushidahardy (on 15. May 2025, 01:25) | 28 | 100 % |
| Crossing A38 by Agent (on 13. May 2025, 09:00) | 26 | 100 % |
| Colossal Fillomino with Sandwich Sudoku by MagnusJosefsson (on 28. September 2022, 15:50) | 68 | 100 % |
| Chaos Construction: Snake by MagnusJosefsson (on 5. June 2021, 13:58) | 44 | 100 % |
