(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 | |
|---|---|---|---|
 | Corner Prison by Prof.Dori (on 7. November 2023, 10:23) | 219 |  95 % |
| X---V*6 by NurglesGift (on 19. May 2025, 18:38) | 102 | 96 % |
| Irregular Sandbattle Sudoku (Starbattle vs. Sandwich) by Osh Tirola (on 14. June 2020, 15:00) | 32 | 97 % |
| Goldfish - Killer Sudoku by Mr.Menace (on 24. March 2021, 10:14) | 33 | 95 % |
| Chaotic Measures by Andrewsarchus (on 1. May 2022, 08:18) | 30 | 95 % |
| The Dirty Dozen by twototenth (on 28. June 2022, 08:00) | 56 | 97 % |
| Numbered Sandwich Counts by RockyRoer (on 2. August 2022, 13:57) | 33 | 96 % |
| Careful with that hook, Emmett ! [S-Cell Sudoku] by Christounet (on 1. March 2023, 15:12) | 63 | 95 % |
| Guidance by Jagga (on 1. July 2023, 20:07) | 32 | 93 % |
| Instructionless by dennischen (on 29. July 2023, 04:44) | 29 | 95 % |
| Mystery Boxes by Sumanta(ANU) (on 21. September 2023, 15:45) | 30 | 90 % |
| Tinsel Box by starwarigami (on 28. December 2023, 09:48) | 29 | 96 % |
| Dutch Flat Mates (Deconstruction X-Sums) (with Palpot) by Flinty (on 5. February 2025, 11:30) | 69 | 97 % |
| Rose Killer Sudoku by SudokuExplorer (on 11. November 2021, 00:00) | 80 | 98 % |
| Sequential Killer Sudoku by SenatorGronk (on 3. August 2020, 15:22) | 55 | 99 % |
| Nordschleife (Bosnian road/multiples pairs sudoku) by Qodec (on 29. November 2024, 20:31) | 54 | 95 % |
| Relationship Status: It's Complicated by 99%Sneaky (on 17. January 2025, 16:25) | 57 | 93 % |
| Yin-Yang Sudoku by Phistomefel (on 12. December 2020, 20:26) | 79 | 95 % |
| Yin Yang Multi-thermos by yttrio (on 8. March 2024, 20:20) | 79 | 98 % |
| ABC-Box mit Hochhauskern (2) by ibag (on 3. July 2013, 08:05) | 65 | 99 % |
