(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 | |
|---|---|---|---|
 | A Game of Battleship! by Niverio (on 14. August 2022, 23:04) | 45 |  100 % |
| Chaos FilloSudokumino: Deconstruction by MagnusJosefsson (on 19. January 2023, 16:12) | 76 | 98 % |
| Atlantis by Kafkapharnaum (on 26. May 2023, 23:22) | 25 | 100 % |
| Pumpkin Wizard by Lizzy01 (on 15. October 2023, 14:09) | 17 | 93 % |
| Diagonal Chaos Construction by Paletron (on 16. October 2023, 18:20) | 34 | 98 % |
| ZZZ-iii-PPP (Deconstruction 11x11) by SparkNights (on 12. February 2024, 06:00) | 15 | 100 % |
| Tetris Sum Line by Chad (on 2. March 2024, 00:51) | 29 | 98 % |
| Landvermessung U-Bahn by KNT (on 27. June 2024, 01:47) | 19 | 100 % |
| U-Bahn with Extra Regions by wooferzfg (on 2. July 2024, 07:46) | 25 | 100 % |
| One Of Two by Manta-Ray (on 18. November 2024, 15:36) | 19 | 91 % |
| Blemish [Even Squares, Kropki, Renban] by 3good5you (on 22. December 2024, 17:47) | 19 | 93 % |
| Shade Your Own Puzzle: Fillomino vs Cave ft. Parity #3 - N difference (13x13) by Playmaker6174 (on 4. January 2025, 03:30) | 44 | 99 % |
| Canyonlands (A38 + Rassi Silai) by sfushidahardy (on 16. March 2025, 17:07) | 15 | 100 % |
| Big Brother (Landvermessung/Battenburg Hybrid) by MaizeGator (on 17. April 2025, 03:08) | 15 | 98 % |
| Sudokoban by DiMono (on 19. January 2023, 16:35) | 64 | 96 % |
| Chaos Loop by wooferzfg (on 1. December 2022, 05:49) | 41 | 99 % |
| Hochhäuser mit Kellern, Teil 3 by pirx (on 3. July 2015, 18:00) | 34 | 99 % |
| Little Thermo Killer by Jesper (on 19. June 2020, 23:30) | 59 | 96 % |
| Sudon'tku by IsaacR (on 19. November 2021, 06:52) | 29 | 91 % |
| Antiknight Thermo Sudoku by PotatoHead21 (on 26. July 2023, 18:25) | 55 | 96 % |
