(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 | |
|---|---|---|---|
 | Peel Back the Layers by XeonRisq (on 10. December 2023, 04:00) | 25 |  92 % |
| Lime Lines II by Calesch (on 10. March 2024, 21:03) | 26 | 92 % |
| Writing a Zeugma by 99%Sneaky (on 7. July 2024, 22:21) | 29 | 95 % |
| Dutch Flat Mates: Three is a Crowd by Flinty (on 11. February 2026, 07:00) | 23 | 93 % |
| Qarpet Beater by Qodec (on 14. November 2020, 14:59) | 61 | 93 % |
| Tapa-Höhle 1 by usp (on 13. March 2015, 00:00) | 58 | 92 % |
| Little Thermo Sudoku by Alexander Rappa (on 16. June 2020, 16:15) | 34 | 96 % |
| Negative Caving by Mark Sweep (on 11. December 2020, 10:00) | 28 | 96 % |
| Murmuration (Little Killer) by emmettcito (on 31. March 2021, 19:38) | 33 | 97 % |
| XY-Cages by glum_hippo (on 1. May 2022, 06:05) | 62 | 93 % |
| Lucky (Symmetrical Palindromic Arrows) by AnalyticalNinja (on 26. July 2022, 23:55) | 33 | 97 % |
| Abstract Nonsense by Oddlyeven (on 13. August 2022, 23:34) | 72 | 97 % |
| Odd Blockade Runners 2 by JeffWajes (on 1. May 2023, 19:18) | 37 | 95 % |
| Cold Sauerkraut (Nabner Thermo Sudoku) by Silverstep (on 24. August 2023, 17:47) | 30 | 91 % |
| Everything is Wrogn by Sumanta(ANU) (on 30. August 2023, 06:23) | 34 | 93 % |
| SET 103: palindromes and arrows by NicoD (on 17. August 2025, 05:30) | 66 | 96 % |
| XX Sandwich by Tomatenalat (on 15. September 2024, 11:46) | 107 | 96 % |
| Sudoku Variants Series (318) - Thermometers - Removed Bulbs by Richard (on 28. April 2021, 00:00) | 71 | 95 % |
| Iso by ICHTUES (on 19. December 2021, 06:00) | 70 | 95 % |
| Criminally Liable by oskode (on 10. April 2025, 11:22) | 81 | 94 % |
