(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 | |
|---|---|---|---|
 | Entropy Antimatter by Mad-Tyas (on 5. March 2024, 16:24) | 38 |  93 % |
| Sunset Cave by wooferzfg (on 4. May 2025, 08:37) | 39 | 93 % |
| Indexed Chaos by Jay Dyer (on 3. September 2022, 23:42) | 81 | 100 % |
| Roller Coaster mit Extras 5 by Uhu (on 11. March 2018, 13:50) | 63 | 99 % |
| Killer Sudoku(003) by cdwg2000 (on 4. September 2020, 01:04) | 53 | 98 % |
| Gabe Ruth hits a homerun by SirWoezel (on 28. April 2021, 18:49) | 29 | 96 % |
| Cycle (Between lines sudoku) by Lizzy01 (on 8. September 2021, 10:45) | 21 | 97 % |
| Sudokutown is That Way by Aaronomys (on 20. February 2022, 14:26) | 40 | 99 % |
| Double negative by filuta (on 26. January 2025, 12:28) | 21 | 100 % |
| Peaceful Destruction by NXTMaster (on 21. November 2025, 00:00) | 30 | 100 % |
| Schrödinger's Triplers by Oddlyeven (on 22. July 2023, 17:44) | 49 | 99 % |
| Pencil puzzle sudoku hybrid series #5 - Slitherlink killer sudoku by Aspartagcus (on 9. January 2021, 14:48) | 32 | 96 % |
| Les Flèches by Joseph nehme (on 15. May 2021, 07:16) | 28 | 90 % |
| I forget what 8 was for by sanabas (on 13. September 2025, 18:12) | 32 | 100 % |
| Nonconsecutive Killer Sudoku by spxtr (on 1. January 2021, 06:21) | 110 | 96 % |
| Blueprints (ft. Andrewsarchus) by Nordy (on 14. May 2025, 09:00) | 92 | 99 % |
| Chaos Construction: Killer Cages by KNT (on 4. April 2022, 23:31) | 130 | 96 % |
| Adventskalender 2023, Türchen 16 - Untergrundangeln by Zzzyxas (on 16. December 2023, 07:00) | 33 | 98 % |
| Sandwich Product by Prof.Dori (on 5. July 2024, 09:28) | 37 | 95 % |
| Chaos Construction by Phistomefel (on 21. April 2020, 00:27) | 162 | 97 % |
