(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 | |
|---|---|---|---|
 | Beep Beep (Killer/German Whispers/Renban/Between Lines) by dumediat (on 18. May 2022, 23:28) | 28 |  93 % |
| Bisection by jsmirob (on 19. May 2022, 04:22) | 18 | 90 % |
| SkyWhispers by manushand (on 22. July 2022, 16:00) | 25 | 93 % |
| Canvas by Crusader175 (on 18. September 2022, 16:00) | 18 | 97 % |
| Sum Line Sudoku #1 by Phistomefel (on 1. October 2022, 10:02) | 145 | 98 % |
| One-Man Band (H+C Region Sum) by brennan77 (on 22. February 2023, 03:39) | 37 | 98 % |
| Komponisten / Composers - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. March 2023, 23:10) | 32 | 95 % |
| Cross-blunder by chameleon (on 29. June 2023, 23:24) | 11 | 95 % |
| Obstructed Skyline (fog) by jwsinclair (on 20. August 2023, 18:13) | 125 | 92 % |
| Wichtel 2022 (3): Weihnachtsgeisterbahn by wichtel (on 13. September 2023, 10:10) | 13 | 100 % |
| Trading Places by Kafkapharnaum (on 21. January 2024, 04:54) | 18 | 95 % |
| To infinity... [Toroïdal U-Bahn] by Christounet (on 6. February 2024, 13:51) | 34 | 98 % |
| Anomaly by Migu (on 12. April 2024, 22:47) | 21 | 93 % |
| Parity Lines Sandwich by RockyRoer (on 29. April 2024, 03:41) | 17 | 92 % |
| More Piles of 15 by Cane_Puzzles (on 31. May 2024, 19:15) | 14 | 98 % |
| Dark City (skyscraper cave with fog) by SkepticalMario (on 30. November 2024, 11:11) | 62 | 92 % |
| Interchangeable 2 by palpot (on 29. January 2025, 22:12) | 11 | 95 % |
| Seance by mathpesto (on 17. February 2025, 23:36) | 62 | 97 % |
| Eight Squares by jovi_al (on 26. September 2021, 23:34) | 112 | 97 % |
| Reachin' some region sums by twototenth (on 6. September 2022, 08:00) | 72 | 97 % |
