(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 | |
|---|---|---|---|
 | Schrödindex by Oddlyeven (on 13. April 2025, 17:40) | 17 |  93 % |
| Howl-py Birthday, ViKingPrime! by ChinStrap (on 21. April 2025, 17:32) | 17 | 95 % |
| Watchtowers by Belamis (on 6. July 2025, 06:15) | 42 | 93 % |
| Looking Left by Md88keys (on 21. July 2025, 15:00) | 24 | 90 % |
| Slipstream (Teleportation Cycle Sums Sudoku) by Feadoor (on 22. July 2025, 10:30) | 16 | 96 % |
| Fantastic 4's and Where to Find Them by Md88keys (on 23. November 2025, 06:47) | 48 | 90 % |
| Quali 2017 - Leftover: U-Bahn by ibag (on 29. January 2017, 20:17) | 52 | 98 % |
| Doppelganger: Crypto Japanese Cave by KNT (on 1. April 2023, 04:05) | 51 | 100 % |
| Odd Tapasyu by usp (on 29. October 2014, 00:00) | 46 | 98 % |
| Scorching paperclips by NicoD (on 28. June 2025, 05:30) | 52 | 95 % |
| Peace Dove by Phurba (on 27. August 2024, 00:07) | 130 | 93 % |
| MasyU-Bahn (Teil 2) by Zzzyxas (on 2. April 2015, 20:35) | 67 | 99 % |
| Chained Killer Sudoku no. 2 by Shinya (on 21. February 2020, 22:48) | 34 | 95 % |
| Battleships! - Sudoku by JeffWajes (on 28. March 2021, 06:13) | 36 | 98 % |
| Squishdomefel by Peter the Dog (on 9. December 2023, 10:22) | 82 | 92 % |
| Pivots (Killer + German Whisper) by Playmaker6174 (on 7. April 2026, 03:00) | 120 | 96 % |
| Chaotic Evil by mathpesto (on 29. April 2022, 00:00) | 138 | 98 % |
| Killer Thermo Sudoku by tsc (on 12. February 2021, 21:12) | 32 | 90 % |
| 25 by ICHTUES (on 26. February 2021, 12:26) | 34 | 98 % |
| Hustle and Bustle by taylorsc (on 11. May 2022, 02:23) | 27 | 95 % |
