(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 | |
|---|---|---|---|
 | Musical Renban by Mayamor (on 20. April 2023, 14:30) | 54 |  95 % |
| Roots in the Fog by Kaktuslav (on 9. August 2025, 08:00) | 213 | 96 % |
| Fishing Pentominoes by Agent (on 12. September 2025, 09:00) | 47 | 100 % |
| Chained Killer Sudoku no. 2 by Shinya (on 21. February 2020, 22:48) | 33 | 95 % |
| Battleships! - Sudoku by JeffWajes (on 28. March 2021, 06:13) | 35 | 97 % |
| REN-BAN by zegres (on 17. October 2023, 05:50) | 50 | 95 % |
| Guns of Icarus by PulverizingPancake (on 2. August 2024, 17:02) | 84 | 94 % |
| Rank Up 16 - Yin Yang by ralphwaldo1 (on 12. September 2024, 23:49) | 37 | 99 % |
| The King's Round Table by DubiousMobius (on 29. September 2024, 03:12) | 37 | 93 % |
| Manta by IcyFruit (on 1. May 2025, 14:01) | 107 | 97 % |
| Japanische Summen mit Rundweg by Uhu (on 14. September 2017, 15:52) | 54 | 98 % |
| Dallas by ICHTUES (on 10. October 2021, 06:00) | 89 | 96 % |
| Pseudoscience by marty_sears (on 7. February 2024, 19:54) | 211 | 96 % |
| Little Killers - But which way? by RockyRoer (on 25. August 2020, 22:39) | 45 | 94 % |
| Caught Between Enemy Lines by Playmaker6174 (on 14. August 2021, 10:07) | 26 | 95 % |
| Chessmates Sudoku by Genomico (on 30. November 2023, 23:54) | 29 | 91 % |
| Trading Places by Kafkapharnaum (on 21. January 2024, 04:54) | 25 | 95 % |
| One Challenge Remaining (Flinty & Palpot) by palpot (on 11. July 2024, 13:36) | 30 | 91 % |
| C. by ThePedallingPianist (on 30. November 2025, 16:30) | 28 | 93 % |
| Fortress at Midnight by Playmaker6174 (on 10. November 2021, 23:35) | 36 | 93 % |
