(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 | |
|---|---|---|---|
 | Valve by Lisztes (on 12. June 2021, 01:00) | 34 |  93 % |
| Connections by TotallyNormalCat (on 6. June 2021, 23:00) | 33 | 99 % |
| Yes, The Clever Equation by SSG (on 28. September 2021, 07:07) | 31 | 95 % |
| Ranked Top 9 Best Digits (Rank Sudoku) by purpl (on 22. March 2022, 21:59) | 19 | 97 % |
| Farsight by sunnyjum (on 24. October 2022, 06:45) | 22 | 91 % |
| Aligned by Jagga (on 23. December 2022, 05:19) | 23 | 92 % |
| Big Mac by ademjaz (on 2. May 2023, 21:52) | 29 | 96 % |
| Japanese Products Sudoku by RockyRoer (on 6. November 2023, 12:00) | 45 | 93 % |
| Interchangeable by palpot (on 2. April 2024, 00:16) | 27 | 96 % |
| Naitrular by Taky (on 13. June 2024, 11:40) | 21 | 92 % |
| Something something lines by filuta (on 7. September 2024, 08:56) | 19 | 94 % |
| German Whispers Delux by Justalilguy (on 20. February 2025, 15:55) | 22 | 97 % |
| dodgeball champ by aqjhs (on 9. September 2025, 01:59) | 21 | 97 % |
| Cambrian by Kafkapharnaum (on 2. October 2025, 21:23) | 20 | 100 % |
| Yin Yang FSOE by flutchman (on 9. November 2025, 10:34) | 95 | 95 % |
| First Rodeo (chaos construction) by jwsinclair (on 28. September 2024, 23:49) | 80 | 97 % |
| Critical Mass (Renban Between Lines) by tallcat (on 13. March 2022, 21:18) | 71 | 96 % |
| Circled X-Sums by RockyRoer (on 22. February 2023, 12:30) | 69 | 97 % |
| Five Arrows (Entropy) by Mad-Tyas (on 24. October 2023, 12:48) | 63 | 93 % |
| Orbital Killer by Realshaggy (on 22. August 2020, 14:29) | 52 | 99 % |
