(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 | |
|---|---|---|---|
 | Sagitta (Anti-XV Arrow Sudoku) by Phistomefel (on 1. August 2022, 17:06) | 126 |  94 % |
| Yin Yang Yin by Xenonetix (on 22. January 2023, 22:22) | 40 | 92 % |
| Antiknight Thermo Sudoku by PotatoHead21 (on 26. July 2023, 18:25) | 56 | 96 % |
| Crossing A38 by Agent (on 13. May 2025, 09:00) | 27 | 96 % |
| Heatstroke (Classic Thermo) by emmettcito (on 11. April 2021, 12:27) | 80 | 97 % |
| The Butterfly Effect by PrimeWeasel (on 5. February 2021, 21:08) | 21 | 97 % |
| Yin Yang Yung by Big Tiger (on 5. December 2022, 23:52) | 18 | 99 % |
| Invisible Cages by Ennead (on 5. March 2023, 15:14) | 22 | 97 % |
| Vivi Loca (Irregular Killer Sudoku) by Qodec (on 2. May 2023, 15:30) | 41 | 94 % |
| Colossal Masyu Masyu-Sudoku by Christounet (on 8. October 2023, 21:52) | 40 | 99 % |
| Ribbon World by Sniglett (on 3. December 2023, 03:31) | 40 | 95 % |
| Candy Cane Cave [Secret Santa 2024] by Calesch (on 29. December 2024, 03:30) | 23 | 100 % |
| Onion by the_cogito (on 7. November 2023, 17:10) | 80 | 98 % |
| Pfeilchenbeet / Arrow Farm by Phistomefel (on 17. November 2020, 20:01) | 55 | 99 % |
| Poltrona by ICHTUES (on 8. May 2022, 05:58) | 33 | 99 % |
| Watchers Along the Cave by tesseralis (on 9. August 2022, 08:54) | 33 | 96 % |
| Santa Puzzle - for dumediat by the_cogito (on 9. January 2023, 18:01) | 31 | 95 % |
| Chaos Sudok-U-Bahn by Christounet (on 21. February 2024, 15:33) | 33 | 98 % |
| Bamboozled by NicoD (on 26. February 2025, 05:34) | 39 | 95 % |
| Chaos Incorporated by Kafkapharnaum (on 4. April 2025, 01:23) | 35 | 100 % |
