(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 | |
|---|---|---|---|
 | Just Wrogn Enough by lerroyy (on 20. May 2022, 18:23) | 61 |  96 % |
| Quaere (Kropki + Counting Quads) by tallcat (on 26. June 2024, 23:37) | 41 | 96 % |
| XY-Differences III by glum_hippo (on 14. July 2020, 02:12) | 43 | 92 % |
| Lunch box by Qodec (on 18. August 2020, 11:18) | 28 | 96 % |
| Multi-grid Multi-variant Sudoku - Simon Is Dead! by DiMono (on 14. November 2020, 09:00) | 25 | 98 % |
| Archers Defending the Castle by GBPack (on 9. May 2021, 06:41) | 48 | 99 % |
| Parity Paradigm by grkles (on 31. December 2021, 13:42) | 22 | 99 % |
| Aquarium Fillomino by wooferzfg (on 4. September 2023, 19:58) | 25 | 100 % |
| Tapa / Islands / Narrow Cave Permaculture by KNT (on 3. July 2024, 02:40) | 23 | 100 % |
| The Swamp (Nurikabe Fillomino) by MaizeGator (on 16. July 2024, 16:37) | 29 | 95 % |
| The Usual Suspects by zetamath (on 22. October 2021, 02:39) | 65 | 97 % |
| Confetti Sums Killer Sudoku by Jesper (on 24. February 2021, 15:10) | 41 | 98 % |
| Neighbors Sudoku by Gliperal (on 26. June 2022, 14:51) | 78 | 96 % |
| Whisper Whisper by Jay Dyer (on 20. August 2022, 13:08) | 39 | 98 % |
| Extraterrestrial Tripleblock with X-Sums by KNT (on 27. May 2023, 16:45) | 34 | 100 % |
| Schrodinger's Split Peas by SamuPiano (on 12. July 2024, 15:44) | 36 | 97 % |
| Marco Polo (Loop Deconstruction) by Agent (on 6. June 2023, 09:00) | 87 | 98 % |
| Cave Fillomino #1 (10x10) by Jesper (on 29. August 2020, 11:40) | 63 | 100 % |
| Twin Killer Sudoku III by Richard (on 8. July 2009, 14:19) | 83 | 93 % |
| Rundweg Family Photo by pokerke (on 14. February 2011, 00:57) | 75 | 100 % |
