(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 | |
|---|---|---|---|
 | Spring Latch by Qodec (on 13. October 2023, 22:07) | 78 |  94 % |
| Nothing is Wrogn by Jay Dyer (on 20. November 2022, 19:49) | 136 | 96 % |
| Scylla (Killer Sudoku) by Phistomefel (on 8. September 2025, 22:41) | 141 | 93 % |
| Magic Clone Knight Sudoku by Rotstein (on 27. May 2020, 01:04) | 35 | 92 % |
| Irregular Sandbattle Sudoku (Starbattle vs. Sandwich) by Osh Tirola (on 14. June 2020, 15:00) | 31 | 97 % |
| Windmill by FryTheGuy (on 4. October 2021, 21:26) | 31 | 96 % |
| Aquarium Escape by zegres (on 6. January 2022, 19:58) | 29 | 92 % |
| Chaotic Measures by Andrewsarchus (on 1. May 2022, 08:18) | 28 | 95 % |
| Chain Reaction (Killer Sudoku) by AstralSky (on 5. December 2022, 15:53) | 60 | 92 % |
| Aquanuradoku by Mennoo_ (on 6. March 2024, 21:33) | 58 | 90 % |
| TetromUNO by yanggang (on 30. May 2024, 20:09) | 31 | 95 % |
| Dragon Ball / ドラゴンボール / 龍珠 by MonsieurTRISTE (on 10. January 2025, 09:23) | 28 | 92 % |
| Splitting hairs (Equal split lines) by Lizzy01 (on 13. April 2025, 17:40) | 33 | 95 % |
| Star of Bethlehem by Aspartagcus (on 25. December 2025, 03:25) | 59 | 95 % |
| Under the Microscope (Infections, Cave) by gdc (on 1. November 2025, 16:05) | 164 | 98 % |
| Leaning Tower Of ZooZ by Joseph nehme (on 7. January 2022, 18:47) | 101 | 96 % |
| Pliers (Anti-King Thermo Sudoku) by Phistomefel (on 17. October 2022, 08:44) | 254 | 97 % |
| Puzzle by usp (on 10. April 2015, 00:00) | 38 | 98 % |
| Locust by antiknight (on 5. August 2022, 00:03) | 42 | 93 % |
| Treasure Map by FryTheGuy (on 7. September 2021, 05:36) | 48 | 97 % |
