(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 | |
|---|---|---|---|
 | Classic Thermo Sudoku by Phistomefel (on 2. February 2021, 22:33) | 110 |  95 % |
| An Actual Suguru Chaos Construction by mathpesto (on 22. May 2022, 16:32) | 94 | 99 % |
| Vierter Pfeilchenstrauß by glum_hippo (on 4. November 2020, 15:53) | 45 | 99 % |
| When X-Sums meet Killer by Joseph nehme (on 8. February 2021, 14:36) | 36 | 96 % |
| 9 Cages by DVFrank (on 4. October 2021, 23:25) | 40 | 98 % |
| Nurimisaki Sudoku - Whispers by Mark Sweep (on 9. November 2022, 16:15) | 43 | 95 % |
| ↻ Somedoku-Loop ↺ by ElChiglia (on 27. April 2024, 07:05) | 37 | 91 % |
| Tellurium Chaos by Nityant5 (on 12. May 2021, 13:02) | 75 | 100 % |
| U-Bahn with Empty Clues (3) by KNT (on 27. July 2023, 04:46) | 75 | 99 % |
| X-Count Mod 3 Sudoku by Timwi (on 2. May 2020, 05:21) | 18 | 90 % |
| Galaxy Killer Key-Clone Sudoku by ahaupt (on 26. May 2020, 18:02) | 21 | 95 % |
| Sandwich Sudoku - Club Sandwich by DiMono (on 31. December 2020, 15:20) | 20 | 97 % |
| Parity Party XVI, "Block Party" by glum_hippo (on 4. March 2021, 05:54) | 19 | 95 % |
| Tartan by grkles (on 10. July 2021, 15:49) | 18 | 97 % |
| What's with the crust these days? by filuta (on 26. July 2021, 19:55) | 16 | 98 % |
| Two Gates by Qodec (on 15. October 2021, 22:22) | 76 | 99 % |
| Knights of Parity by Fafrd (on 27. May 2022, 06:38) | 21 | 97 % |
| Balance of Power by Raumplaner (on 26. June 2022, 14:40) | 23 | 93 % |
| Kolot Challenge Accepted by Andrewsarchus (on 7. November 2022, 14:44) | 19 | 92 % |
| Sub Zero Nabner by gdc (on 27. September 2023, 13:05) | 57 | 97 % |
