(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 | |
|---|---|---|---|
 | Lie-rises (Flinty Collab) by palpot (on 31. December 2024, 20:15) | 22 |  95 % |
| Japanese Icewalk (1) by KNT (on 17. August 2025, 20:44) | 52 | 99 % |
| una isla de pairrows by aqjhs (on 23. January 2026, 00:00) | 28 | 97 % |
| Escape Pod by TrivialHomology (on 27. March 2026, 13:23) | 47 | 97 % |
| Chaos Zippers by Visumation (on 19. January 2025, 13:10) | 76 | 92 % |
| Mehrdeutige Rätsel - Rundweg 2 by uvo (on 22. February 2017, 10:01) | 44 | 95 % |
| Little Killer Madness by djorr (on 22. September 2021, 14:00) | 41 | 93 % |
| Position Sums: Fillomino (11x11) by ONeill (on 20. October 2022, 05:59) | 45 | 100 % |
| Meidjuizy by Lizzy01 (on 14. November 2023, 11:36) | 43 | 100 % |
| Catch The Zippersnake by marty_sears (on 8. January 2024, 01:41) | 135 | 97 % |
| Doublers Make Me Loop-Pea! by SamuPiano (on 9. September 2024, 15:44) | 39 | 93 % |
| Red + Blue = Purple by Kaktuslav (on 21. July 2025, 17:54) | 88 | 97 % |
| Uncertain Sudoku #8 - Frame or X-Sums by Feadoor (on 27. March 2020, 17:00) | 55 | 96 % |
| Pear Tree by jwsinclair (on 17. March 2025, 21:48) | 75 | 93 % |
| Sudoku Variants Series (418) - Sum and Product Killer by Richard (on 4. April 2025, 12:00) | 81 | 96 % |
| 10-in-9 killer sudoku #4 by Nylimb (on 21. February 2020, 17:48) | 36 | 98 % |
| Silent Night by titus (on 18. December 2020, 02:06) | 26 | 90 % |
| Sandwich Cosmic Sudoku - Follow the North Galaxy by DiMono (on 27. December 2020, 21:37) | 20 | 93 % |
| Anjou by Konzert (on 21. February 2021, 22:12) | 45 | 95 % |
| 15x15 Standard Pentominous by stefliew (on 28. March 2021, 08:46) | 40 | 99 % |
