(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 | |
|---|---|---|---|
 | The Graveyard Of Shadows by fjam (on 22. September 2022, 19:02) | 69 |  97 % |
| Sudokurotto by Phistomefel (on 15. September 2021, 07:39) | 116 | 99 % |
| Arrow Ratio Sudoku by SudokuExplorer (on 12. January 2022, 00:00) | 42 | 97 % |
| XS-ive Chaos by mathpesto (on 27. February 2022, 03:10) | 47 | 98 % |
| Außerirdischer und Osterhase by ibag (on 20. April 2014, 05:10) | 23 | 96 % |
| Killer Little Killer Sudoku by Willy Wonka (on 18. August 2020, 15:27) | 48 | 96 % |
| Lying Stars 2 (Liar Partial Killer) by Djmelee3000 (on 21. September 2020, 06:02) | 26 | 94 % |
| Nuribou Sudoku by glum_hippo (on 3. April 2021, 06:00) | 23 | 99 % |
| Ricochet (Arrow Killer) by tallcat (on 11. June 2021, 16:01) | 53 | 91 % |
| Wichtel 2021 (1): Die Stadtviertel von Pentopia by wichtel (on 26. May 2022, 22:10) | 22 | 94 % |
| Knights & Knaves by ndsurgenor (on 23. October 2022, 12:00) | 22 | 94 % |
| First Burn by dennischen (on 4. May 2023, 08:22) | 27 | 95 % |
| Cryptic Snakewords by marty_sears (on 26. January 2024, 02:34) | 28 | 100 % |
| Maximal Anti-Killer Sudoku by Madmahogany (on 17. July 2020, 23:12) | 32 | 94 % |
| 6 PM Reservation... by Sktx (on 25. October 2021, 18:15) | 26 | 92 % |
| dOUBLE tHINK by Abdul the Killer (on 9. January 2024, 12:34) | 29 | 93 % |
| Happy Holiday! by Richard (on 15. July 2011, 12:00) | 55 | 91 % |
| Pointing Digits Sudoku by clover (on 3. February 2024, 20:03) | 78 | 96 % |
| Parity Party (Odd-Even coded) by Realshaggy (on 11. February 2021, 21:55) | 24 | 98 % |
| Connections by TotallyNormalCat (on 6. June 2021, 23:00) | 28 | 99 % |
