(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 | |
|---|---|---|---|
 | Gemstones by Scojo (on 17. July 2024, 21:29) | 17 |  91 % |
| Läufer Loop by Prof.Dori (on 23. September 2024, 12:17) | 40 | 99 % |
| Yakamoz by Niverio (on 22. December 2024, 11:28) | 27 | 99 % |
| Sixteen Candles by Farkov (on 9. March 2025, 03:02) | 13 | 93 % |
| Fisherman's Bend (Appendix Lines) by DubiousMobius (on 17. March 2025, 14:43) | 13 | 91 % |
| Narrow Laneway Filled With Crooks by 99%Sneaky (on 30. August 2025, 00:53) | 27 | 95 % |
| Suspicious Bilateralisms by jennyaa (on 7. November 2025, 01:02) | 12 | 91 % |
| Parity Mirror by zegres (on 2. May 2022, 04:41) | 81 | 100 % |
| Chaotic Sums by kuraban (on 26. October 2022, 19:34) | 81 | 97 % |
| Roller Coaster Fillomino #2 (9x9) by Jesper (on 21. April 2021, 09:08) | 61 | 100 % |
| 10+ Line Sudoku by Phistomefel (on 1. September 2022, 10:03) | 186 | 98 % |
| Neue Post aus Rätselhausen by Statistica (on 1. December 2015, 00:12) | 49 | 95 % |
| Chaos Construction: Akari by Niverio (on 25. June 2022, 21:28) | 50 | 98 % |
| Wormholes (Remix) by Nordy (on 14. May 2023, 08:00) | 54 | 97 % |
| The Renban Code by juggler (on 18. August 2024, 12:10) | 53 | 95 % |
| Höhlen-U-Bahn (Teil 3) by Zzzyxas (on 18. May 2019, 11:31) | 73 | 100 % |
| Roller Coaster mit Extras 18 by Uhu (on 10. May 2020, 20:16) | 39 | 98 % |
| The French Connec7ion by Zombie Hunter (on 20. July 2021, 22:45) | 43 | 97 % |
| X-Sum Skyscraper (hybrid) by GarlicBredFries (on 15. November 2021, 07:53) | 34 | 95 % |
| Spot the Difference by marty_sears (on 13. December 2023, 03:29) | 130 | 97 % |
