(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 | |
|---|---|---|---|
 | Alpträume by ibag (on 27. March 2017, 23:55) | 37 |  99 % |
| Roller Coaster mit Extras 11 by Uhu (on 11. October 2018, 18:15) | 50 | 96 % |
| Machtwechsel in Rätselhausen by Statistica (on 1. December 2018, 18:18) | 30 | 99 % |
| Japanische Bahnhöfe, Teil 2 by pirx (on 27. May 2020, 13:00) | 24 | 100 % |
| Invisible Cages by Big Tiger (on 25. March 2021, 10:42) | 27 | 95 % |
| Chained killer sudoku no. 3 by Shinya (on 23. August 2021, 22:33) | 25 | 99 % |
| Equal Sudoku by kolot (on 25. October 2021, 07:39) | 26 | 99 % |
| Anti-Knight, Arrows, and Renban by Jeet Sampat (on 26. October 2021, 23:26) | 35 | 94 % |
| DEATH (collaboration) by grkles (on 4. January 2022, 22:20) | 41 | 99 % |
| Killer Ambiguity by abed hawila (on 8. February 2022, 00:34) | 43 | 98 % |
| Progressive Divisors by DiMono (on 3. April 2022, 21:10) | 48 | 96 % |
| Killer - Region Sum Lines - Cave by abed hawila (on 9. May 2022, 20:41) | 66 | 100 % |
| Full Rank Sandwich by RockyRoer (on 5. June 2022, 03:22) | 48 | 100 % |
| The Great Wall by tesseralis (on 9. September 2022, 07:42) | 43 | 98 % |
| Build Your Own Killer: High Pressure by Playmaker6174 (on 14. September 2022, 22:27) | 40 | 100 % |
| Flaschenpost (Nurikabe Cipher Sudoku) by Agent (on 4. October 2022, 09:00) | 56 | 98 % |
| Squbler's 100 by mormagli (on 18. October 2022, 02:39) | 38 | 95 % |
| Lighthouse Nurikabe by Gliperal (on 8. February 2023, 20:57) | 14 | 94 % |
| Above Thy Neighbour by marty_sears (on 20. June 2023, 19:20) | 32 | 92 % |
| Wichtel 2022 (1): Die Neue Karte von Krakatau by wichtel (on 22. June 2023, 08:08) | 14 | 96 % |
