(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 | |
|---|---|---|---|
 | Pentominous U-Bahn (Warm-up #2) by KNT (on 15. November 2024, 09:15) | 50 |  100 % |
| The Final Shot: Four Corners 4 (Renban Arrow X) by tallcat (on 7. January 2022, 04:45) | 49 | 94 % |
| Back & Forth by fjam (on 29. September 2022, 13:52) | 44 | 93 % |
| Yin × Yang = ? by SparkNights (on 9. September 2023, 04:00) | 47 | 95 % |
| Modular Region Sum Lines Sudoku by Phistomefel (on 7. March 2024, 20:52) | 145 | 98 % |
| Renban Skyscrapers by Florian Wortmann (on 26. June 2021, 13:41) | 43 | 92 % |
| Right Twice a Day by JeffWajes (on 11. August 2025, 05:39) | 50 | 96 % |
| Mirrors by jovi_al (on 9. June 2021, 06:25) | 96 | 98 % |
| 58 by Qodec (on 10. October 2020, 16:34) | 49 | 97 % |
| Anti-Knight Killer Sudoku by SudokuExplorer (on 18. November 2021, 00:00) | 50 | 94 % |
| Ocean Spray by Florian Wortmann (on 6. February 2024, 18:50) | 97 | 96 % |
| Build Your Own Region Sums by Jay Dyer (on 23. January 2022, 20:27) | 41 | 99 % |
| Angels by goodcity (on 8. October 2023, 18:03) | 48 | 93 % |
| Equally Mad (Dynamic FoW) by gdc (on 13. August 2025, 11:40) | 54 | 94 % |
| Rätselwochenende: Table for Four - Battleship by uvo (on 26. November 2014, 16:40) | 39 | 94 % |
| LM-Training: Japanisches Summen-Masyu by rob (on 4. June 2018, 23:22) | 43 | 93 % |
| Shikaku Fillomino #2 (9x9) by the_cogito (on 15. September 2022, 15:41) | 43 | 96 % |
| A Shot in the Dark (Whisper Arrow) by tallcat (on 11. November 2021, 15:28) | 48 | 97 % |
| Pennington by wooferzfg (on 6. October 2022, 05:42) | 41 | 96 % |
| Foggy Fillomino by Die Hard (on 31. December 2024, 23:24) | 104 | 95 % |
