(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 | |
|---|---|---|---|
 | Wichtel 2016 (12 und Schluss): Unterirdische Katakomben mit Kerzenbeleuchtung by wichtel (on 12. October 2017, 21:01) | 26 |  98 % |
| Parity Paradigm by grkles (on 31. December 2021, 13:42) | 25 | 99 % |
| Chaos Sum-dok-U-Bahn by Christounet (on 9. December 2024, 08:07) | 27 | 99 % |
| Who Knows Where the Time Goes by juggler (on 28. December 2024, 07:50) | 61 | 96 % |
| Foggy “Pair”-rows by Visumation (on 8. January 2025, 14:09) | 59 | 91 % |
| Chained killer sudoku no. 3 by Shinya (on 23. August 2021, 22:33) | 26 | 99 % |
| Killoc4tor: Kill List by starwarigami (on 14. November 2021, 03:07) | 27 | 99 % |
| Stroopwafel by pieguy (on 19. October 2023, 23:13) | 29 | 92 % |
| Penumbra (Shadow Sums Sudoku) by Feadoor (on 19. June 2025, 10:56) | 33 | 94 % |
| kNights, uNite! by Alphish (on 17. July 2020, 02:33) | 37 | 92 % |
| Build Your Own Aquarium by wooferzfg (on 5. February 2022, 16:54) | 34 | 100 % |
| 159 Sandwiches by RockyRoer (on 19. February 2021, 21:33) | 34 | 99 % |
| Anableps (Aquarium + Myopia) by sfushidahardy (on 17. February 2025, 17:38) | 34 | 100 % |
| Pointing parodies by someguy209 (on 21. September 2024, 04:35) | 42 | 92 % |
| Bodysnatchers by AnalyticalNinja (on 1. October 2024, 20:07) | 122 | 99 % |
| Going in Circles by antiknight (on 1. December 2022, 15:06) | 46 | 95 % |
| Above Thy Neighbour by marty_sears (on 20. June 2023, 19:20) | 51 | 91 % |
| Ma'at's Transcript: Order from Chaos (Chaos Construction) by Chilly (on 13. July 2022, 13:07) | 88 | 100 % |
| Sky-Skyscraper by Phistomefel (on 22. March 2024, 15:29) | 85 | 99 % |
| DEATH (collaboration) by grkles (on 4. January 2022, 22:20) | 42 | 99 % |
