(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 | |
|---|---|---|---|
 | What Do Little Killers Eat? by RockyRoer (on 14. October 2022, 03:47) | 65 |  96 % |
| Nexus [Fog of War Sudoku] by wisty (on 6. March 2023, 02:14) | 78 | 92 % |
| LM Gapped Kakuro by yureklis (on 3. January 2011, 23:50) | 85 | 95 % |
| Lowrider by Wuschel (on 20. March 2024, 08:46) | 46 | 92 % |
| Numbered Walls by Niverio (on 21. July 2022, 23:57) | 64 | 100 % |
| Sudoku Variants Series (375) - Odd-Even Thermometers by Richard (on 13. July 2022, 02:00) | 99 | 96 % |
| Schach - Lügendetektor Logical by DocLogic (on 30. April 2020, 22:24) | 20 | 92 % |
| Mantis by Tyrgannus (on 14. September 2021, 01:08) | 27 | 92 % |
| Close Friends II by mathpesto (on 24. December 2021, 07:06) | 25 | 91 % |
| Belegtes Brot by ICHTUES (on 5. February 2023, 06:00) | 21 | 92 % |
| Golden Cages by Prof.Dori (on 4. May 2024, 21:12) | 28 | 91 % |
| Fraction Party by sujoyku (on 12. September 2023, 19:46) | 54 | 96 % |
| Toroidales Tapasyu 2 by usp (on 25. October 2014, 00:00) | 57 | 98 % |
| Revolution by Stavros96 (on 18. September 2021, 10:54) | 28 | 97 % |
| Canadian Whispers by Mojo872 (on 15. December 2021, 07:13) | 55 | 96 % |
| Several Little Boxes by jsmirob (on 17. November 2022, 04:39) | 31 | 93 % |
| Extenban YYSL by Blobz (on 25. December 2023, 16:00) | 64 | 98 % |
| Fifteen All by Phurba (on 10. June 2024, 12:54) | 55 | 91 % |
| The Door around the Corner by XeonRisq (on 16. July 2023, 20:00) | 121 | 98 % |
| Thermo Sudoku by Realshaggy (on 26. May 2020, 22:31) | 90 | 94 % |
