(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 | |
|---|---|---|---|
 | Nineteen by FryTheGuy (on 29. November 2021, 16:51) | 37 |  93 % |
| Vikavolt by tesseralis (on 14. September 2022, 05:41) | 33 | 94 % |
| 3... 2... 1... Meteor Strike! by igniteice (on 28. November 2023, 16:04) | 42 | 90 % |
| Partial Manhattan Sudoku by Madmahogany (on 29. April 2020, 14:20) | 43 | 95 % |
| Glowworms by mathpesto (on 17. November 2023, 00:03) | 61 | 94 % |
| Rundweg mit gespaltener Persönlichkeit by Calavera (on 1. July 2009, 16:23) | 86 | 99 % |
| Chaos Construction: Loop Sum by Phistomefel (on 8. April 2022, 18:16) | 131 | 99 % |
| Jet Lag (Renban Killer Sudoku) by Agent (on 29. April 2022, 09:00) | 24 | 95 % |
| Four Unique Ways by kolot (on 30. April 2022, 16:38) | 37 | 91 % |
| Sum Kind of Maze by mormagli (on 28. July 2022, 19:24) | 17 | 91 % |
| Venomous Snakes by lepton (on 2. February 2023, 16:27) | 34 | 99 % |
| Arrow Replica Addition by PotatoHead21 (on 30. April 2023, 17:34) | 17 | 91 % |
| Meta-Icing by Kafkapharnaum (on 11. July 2023, 01:24) | 15 | 100 % |
| Assassins by The Book Wyrm (on 8. November 2023, 00:14) | 17 | 100 % |
| Pêcher pour pêches (Killer Sudoku with Same Size Same Sum) by purpl (on 27. April 2024, 23:58) | 18 | 93 % |
| Headmaster's Toe (Anti-Knight, Renban) by juddimal (on 4. January 2025, 22:23) | 32 | 90 % |
| Every Which Way But Up by HalfBakedLunatic (on 19. January 2025, 19:03) | 57 | 91 % |
| Fifth Wheel by IcyFruit (on 27. February 2025, 14:27) | 24 | 96 % |
| Foggy Banren by DarthParadox (on 9. August 2024, 23:18) | 85 | 95 % |
| Isolation by Nahileon (on 21. January 2022, 14:41) | 56 | 93 % |
