(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 | |
|---|---|---|---|
 | Subway Lines (Chaos Sandwich Sudoku) by Agent (on 15. April 2022, 09:00) | 45 |  98 % |
| LM 2022 Leftover: Teilchenzoo by lupo (on 30. August 2022, 20:22) | 13 | 100 % |
| Renbanage by Celery (on 14. November 2022, 00:58) | 30 | 94 % |
| Reconstructed Frame by XeonRisq (on 23. March 2023, 20:00) | 32 | 93 % |
| Hybrid Star Battle Series (012) - Masyu by BenceJoful (on 26. March 2023, 16:31) | 30 | 94 % |
| Musical Renban by Mayamor (on 20. April 2023, 14:30) | 51 | 95 % |
| Sphygmomanometer by ViKingPrime (on 15. January 2024, 17:00) | 15 | 96 % |
| Cosmic Balance (FoW) by Nurator (on 20. January 2024, 20:16) | 186 | 96 % |
| Croque Madame by Black_Doom (on 14. April 2024, 17:07) | 14 | 94 % |
| The Way You Look Tonight by juggler (on 5. June 2024, 06:52) | 45 | 94 % |
| All the Arrows, Big and Small by bboom (on 24. October 2024, 10:06) | 49 | 95 % |
| Twin Killer Sudoku VI by Richard (on 29. August 2014, 12:00) | 80 | 96 % |
| Pinch Yourself (Killer Sudoku) by purpl (on 1. February 2022, 22:31) | 63 | 95 % |
| Squishdomefel by Peter the Dog (on 9. December 2023, 10:22) | 56 | 94 % |
| LUSTIG - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 27. January 2021, 17:43) | 34 | 95 % |
| Renban ModE - Little Killer/Renban sudoku by Mr.Menace (on 29. May 2021, 17:43) | 37 | 98 % |
| King's Gambit by GemmaOane (on 2. August 2023, 19:12) | 89 | 95 % |
| Do Androids Dream of Electric Sheep? by Abdul the Killer (on 21. May 2024, 12:34) | 79 | 99 % |
| Six-pack Linked Sudokus #4 by Genomico (on 12. March 2021, 01:16) | 75 | 99 % |
| KICK 4 by timyoth (on 8. April 2024, 11:05) | 96 | 93 % |
