(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 | |
|---|---|---|---|
 | Double Arrow Sudoku by tesseralis (on 30. June 2023, 03:44) | 24 |  90 % |
| Double Jointed by 99%Sneaky (on 2. September 2023, 19:00) | 21 | 92 % |
| Duplexity by Sotehr (on 9. December 2024, 02:00) | 38 | 96 % |
| Lie-rises (Flinty Collab) by palpot (on 31. December 2024, 20:15) | 18 | 94 % |
| Colour Quest by Fenners (on 12. January 2025, 21:02) | 104 | 95 % |
| Daybreak (Antiknight Thermo Sudoku) by Playmaker6174 (on 11. October 2022, 04:47) | 91 | 97 % |
| Iso by ICHTUES (on 19. December 2021, 06:00) | 65 | 96 % |
| Chocolate Teapot by Qodec (on 5. May 2021, 16:01) | 73 | 97 % |
| Weighted Cells by Oddlyeven (on 12. November 2024, 19:55) | 77 | 97 % |
| Galaxy Killer Sudoku by Phistomefel (on 11. May 2020, 11:33) | 101 | 96 % |
| Sandwich/Killer Sudoku - Find x Part 3 by ProwlingTiger (on 27. May 2020, 20:00) | 27 | 94 % |
| Disjoint Killer Arrows by Joseph nehme (on 13. December 2020, 17:11) | 25 | 96 % |
| Killer Sudoku 311 by Quarterthru (on 20. March 2021, 12:00) | 32 | 96 % |
| # (Arrow Sudoku) by Cane_Puzzles (on 4. June 2021, 17:00) | 23 | 96 % |
| Aquarium Escape by zegres (on 6. January 2022, 19:58) | 26 | 92 % |
| Kropkikabe by MmeMagique (on 28. May 2023, 18:00) | 24 | 93 % |
| Behaving Loop by ElChiglia (on 11. November 2023, 07:35) | 33 | 99 % |
| Dual U-Bahn by Paletron (on 12. April 2024, 20:45) | 23 | 100 % |
| Parroty Lines by marty_sears (on 29. April 2024, 13:52) | 138 | 96 % |
| Cage Match by silent_rob (on 29. July 2024, 08:00) | 29 | 93 % |
