(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 | |
|---|---|---|---|
 | X-Sums Fillomino #3 (4x4x4) by Jesper (on 15. March 2021, 19:53) | 36 |  100 % |
| Pentominous sandwich sudoku by Nylimb (on 28. April 2021, 17:11) | 19 | 97 % |
| 3D Tapa - Count to Five by athin (on 25. June 2021, 12:00) | 16 | 98 % |
| A + N ∞ (Palindrome + kropki sudoku) by Aspartagcus (on 16. July 2021, 00:02) | 21 | 97 % |
| Roadmap by vidarino (on 14. November 2021, 19:21) | 20 | 97 % |
| ew by mathpesto (on 26. June 2022, 18:28) | 62 | 96 % |
| Second Region X-Sums Chaos by Elliptical (on 20. November 2022, 21:22) | 41 | 98 % |
| Easter Eggs by Jobo (on 31. March 2024, 09:09) | 64 | 98 % |
| Whirlpool by vitaminz (on 13. September 2024, 03:39) | 40 | 91 % |
| Latent Entanglement by 99%Sneaky (on 14. February 2025, 18:15) | 65 | 95 % |
| What Do Little Killers Eat? by RockyRoer (on 14. October 2022, 03:47) | 65 | 96 % |
| Yajilin Dutch Whispers by yttrio (on 7. September 2024, 01:37) | 57 | 98 % |
| Lowrider by Wuschel (on 20. March 2024, 08:46) | 46 | 92 % |
| Schach - Lügendetektor Logical by DocLogic (on 30. April 2020, 22:24) | 21 | 92 % |
| Mantis by Tyrgannus (on 14. September 2021, 01:08) | 28 | 92 % |
| Close Friends II by mathpesto (on 24. December 2021, 07:06) | 25 | 91 % |
| Snake Nest Sudoku (chaos construction) by Al Fresco (on 9. December 2022, 20:47) | 25 | 96 % |
| Belegtes Brot by ICHTUES (on 5. February 2023, 06:00) | 21 | 92 % |
| Golden Cages by Prof.Dori (on 4. May 2024, 21:12) | 30 | 91 % |
| Position Sums Thermo Sudoku by clover (on 26. January 2025, 12:53) | 24 | 92 % |
