(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 | |
|---|---|---|---|
 | Irrwisch Sudoku: Sandwich by Gliperal (on 22. May 2023, 11:30) | 37 |  98 % |
| Tapa mit Steigerung by berni (on 5. February 2009, 15:07) | 170 | 95 % |
| Sumsweeper by Xenonetix (on 9. May 2022, 01:33) | 47 | 96 % |
| 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 % |
| Sparkle by Myxo (on 21. April 2024, 13:00) | 35 | 95 % |
| Partial Manhattan Sudoku by Madmahogany (on 29. April 2020, 14:20) | 43 | 95 % |
| Japanische Summen PQR by tuace (on 4. November 2016, 15:30) | 47 | 98 % |
| Battle With The Archers 41: The Fate of Three Worlds by Playmaker6174 (on 9. October 2023, 10:01) | 52 | 96 % |
| 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 % |
| Sandwich Battle 2 by Strosahl (on 22. September 2020, 19:22) | 34 | 94 % |
| Embraced by Qodec (on 6. November 2020, 18:56) | 65 | 97 % |
| Still no cage totals... - Odd/Even Killer Sudoku (#6) by Mr.Menace (on 14. May 2021, 23:02) | 26 | 95 % |
| High f**e! by filuta (on 30. March 2022, 15:29) | 41 | 96 % |
| Sum Kind of Maze by mormagli (on 28. July 2022, 19:24) | 17 | 91 % |
| Spiral Fillodoku (Spiral Galaxy, Fillomino, Killer sudoku hybrid) by AnalyticalNinja (on 29. March 2023, 21:25) | 57 | 98 % |
| Parity Killer by SudokuExplorer (on 7. July 2021, 03:36) | 40 | 94 % |
| Think outside the snake by filuta (on 25. June 2022, 21:13) | 40 | 95 % |
