(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 | |
|---|---|---|---|
 | Thermoconstrictor by HalfBakedLunatic (on 27. October 2023, 19:20) | 66 |  93 % |
| Goldenrod weathercock by NicoD (on 25. April 2025, 05:30) | 57 | 96 % |
| $10 Modular Housing by mellowrobinson (on 3. December 2025, 16:38) | 28 | 94 % |
| Thermo Sudoku by Realshaggy (on 26. May 2020, 22:31) | 92 | 94 % |
| The Butterfly Effect - Region Sum Lines Sudoku by Mr.Menace (on 28. February 2022, 20:11) | 103 | 97 % |
| Dutch-pelgänger by ChinStrap (on 6. December 2025, 16:19) | 56 | 96 % |
| Knightmare on Mount Pleasant Avenue by HalfBakedLunatic (on 25. March 2024, 22:21) | 98 | 95 % |
| Even The Odd Arrow by tzael (on 28. July 2020, 09:26) | 30 | 91 % |
| Astronomic Squares Sudoku by Philipp Huber (on 7. August 2020, 10:35) | 27 | 90 % |
| Slingshot Sudoku - Confrontation by stephane.bura (on 26. August 2020, 20:00) | 28 | 96 % |
| Singularity Fever [Thermo] by Miky (on 14. June 2021, 20:47) | 31 | 96 % |
| Arrow Dynamics by SSG (on 23. June 2021, 07:58) | 35 | 97 % |
| Battle With The Archers 28: Between Friends and Enemies (part 2) by Playmaker6174 (on 14. February 2022, 02:50) | 34 | 97 % |
| Wildberry Poptart by Tyrgannus (on 4. August 2022, 11:16) | 136 | 99 % |
| Speak Of The Devil... by Perladel (on 14. September 2022, 13:33) | 37 | 91 % |
| Diversity Killer by Migu (on 4. June 2023, 00:36) | 33 | 96 % |
| Circles and Between Lines by stimim (on 7. September 2023, 07:10) | 33 | 97 % |
| Cramped for Space by XeonRisq (on 23. April 2025, 18:00) | 35 | 95 % |
| Remnant (Overlaps/Coordinate arrows) by dumediat (on 28. June 2025, 08:00) | 27 | 97 % |
| Intereference by ChinStrap (on 10. September 2025, 20:20) | 30 | 96 % |
