(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 | |
|---|---|---|---|
 | Adventssterne: Full Rank Star by Realshaggy (on 15. December 2019, 06:00) | 32 |  91 % |
| Median Quads by RockyRoer (on 13. November 2021, 05:07) | 21 | 92 % |
| World of Weird Wonders - A 7x7 Irregular Sudoku Pack by Playmaker6174 (on 18. December 2021, 10:35) | 21 | 93 % |
| Baltimore by ICHTUES (on 2. January 2022, 06:00) | 53 | 97 % |
| When-in-drome by Mojo872 (on 20. April 2022, 03:41) | 23 | 94 % |
| Ruined Arch by Jay Dyer (on 24. July 2022, 19:30) | 24 | 97 % |
| Die Kryptos - S05E02: Teilchenzoo by tuace (on 1. September 2022, 20:22) | 20 | 99 % |
| Horst and Graben (Renban, German Whispers, Kropki pairs) by Bellsita (on 24. August 2022, 01:32) | 30 | 97 % |
| Masyudoku - Sudoku / Masyu Hybrid by Mr.Menace (on 2. November 2022, 21:14) | 63 | 98 % |
| Turkish Art: Painting Arrows (CTC Secret Santa 2022) by Niverio (on 27. December 2022, 02:29) | 33 | 100 % |
| 3 Bags Full by panthchesh (on 30. January 2023, 02:17) | 24 | 93 % |
| Precision (Equalines, Doubler) by Mad-Tyas (on 25. April 2023, 09:32) | 21 | 99 % |
| Quadrilateral by jwsinclair (on 20. April 2024, 18:03) | 94 | 99 % |
| A View to a Kill by DadJokes (on 30. April 2024, 22:37) | 25 | 93 % |
| Bent Glass by arbitrary (on 12. May 2024, 13:00) | 47 | 94 % |
| Mod Pods (with gdc) by SamuPiano (on 26. September 2024, 15:44) | 32 | 98 % |
| Mafia (Chaos Construction) by Agent (on 7. November 2023, 09:00) | 122 | 97 % |
| Japanische Summen mit Pentominos by Uhu (on 19. July 2018, 22:22) | 57 | 98 % |
| Cageless (X) Killer Sudoku by Shinya (on 13. March 2020, 17:26) | 60 | 99 % |
| Candles in the Dark by Dave Sandwich (on 22. November 2022, 23:44) | 68 | 92 % |
