(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 | |
|---|---|---|---|
 | NATUR - Buchstabenrätsel by DocLogic (on 2. January 2020, 16:41) | 43 |  92 % |
| 10-in-9 killer sudoku #2 by Nylimb (on 30. January 2020, 12:36) | 42 | 96 % |
| Foggy Pea-losophy by SamuPiano (on 2. November 2024, 15:44) | 109 | 97 % |
| Wichtelkalender 2013 - August by SilBer (on 1. August 2013, 00:00) | 53 | 99 % |
| Carrousel - (Little) Killer / Sandwich Sudoku by SlowLarry (on 23. August 2020, 21:32) | 29 | 97 % |
| Battle With The Archers 33: Between Friends and Enemies (part 3) by Playmaker6174 (on 21. June 2022, 08:52) | 29 | 97 % |
| Lost by Joseph nehme (on 24. June 2022, 19:30) | 57 | 96 % |
| Arrow Courtyard by PotatoHead21 (on 16. February 2023, 10:33) | 31 | 95 % |
| RemotelyEntropic by Palfly Kampling (on 27. May 2023, 18:52) | 26 | 95 % |
| Areal Sudoku by ICHTUES (on 4. February 2021, 12:26) | 73 | 96 % |
| pH Anti-Knight Killer Sudoku by udukos (on 18. July 2020, 16:49) | 47 | 94 % |
| Battle With The Archers 12: Silent Threat by Playmaker6174 (on 21. August 2021, 17:17) | 42 | 95 % |
| 1000 Rooms by Qodec (on 10. May 2022, 22:37) | 43 | 94 % |
| Urban Renewal (11x11 deconstruction) by jwsinclair (on 24. May 2022, 21:25) | 46 | 97 % |
| Constellation by tenaliraman (on 15. July 2022, 09:03) | 44 | 97 % |
| Battle With The Archers 35: The Conflict of Three Worlds by Playmaker6174 (on 8. September 2022, 03:57) | 46 | 96 % |
| Loopy Whisper 'Wich by yttrio (on 24. May 2024, 21:47) | 36 | 96 % |
| 100 by Klvsched (on 14. August 2024, 12:51) | 45 | 94 % |
| To The Skies by Piatato (on 14. October 2021, 22:25) | 62 | 97 % |
| Rorschach (Thermo) by tallcat (on 23. June 2022, 17:06) | 61 | 95 % |
