(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 | |
|---|---|---|---|
 | Operation Arrows by EliasKar (on 17. January 2021, 16:25) | 32 |  100 % |
| The Butterfly Effect by PrimeWeasel (on 5. February 2021, 21:08) | 20 | 97 % |
| Chaos Construction: Minesweeper by Phistomefel (on 29. March 2021, 13:28) | 90 | 98 % |
| The Barbed Cross by SSG (on 30. June 2021, 11:26) | 13 | 92 % |
| Spiral Galaxy Sudoku with clues by PrimeWeasel (on 13. November 2021, 16:55) | 17 | 98 % |
| Flying Arrows by antiknight (on 2. March 2022, 19:36) | 42 | 91 % |
| Menagerie by SSG (on 13. December 2022, 07:14) | 20 | 94 % |
| Syzygies of Susurrus by JayForty (on 3. March 2023, 21:55) | 26 | 91 % |
| Fillomino 77 by Myxo (on 1. August 2023, 13:15) | 35 | 97 % |
| A Whole Bunch of Nonsense by Myxo (on 30. October 2023, 22:00) | 66 | 97 % |
| Ribbon World by Sniglett (on 3. December 2023, 03:31) | 38 | 95 % |
| Knights Mate by blackjackfitz (on 17. January 2024, 20:52) | 39 | 95 % |
| I.M.A.P.P: Wild Japanese Sum Tapa (12x12) by Playmaker6174 (on 29. January 2024, 22:31) | 17 | 97 % |
| ZZZ-iii-PPP (Deconstruction 11x11) by SparkNights (on 12. February 2024, 06:00) | 13 | 100 % |
| Treasure Box (Entropy Killer) by Mad-Tyas (on 26. February 2024, 18:19) | 44 | 91 % |
| Tetris Sum Line by Chad (on 2. March 2024, 00:51) | 26 | 98 % |
| Semi-Symmetry by Lizzy01 (on 20. September 2024, 11:44) | 21 | 97 % |
| The Ballad of Buster Scruggs by SamuPiano (on 4. February 2025, 15:44) | 23 | 94 % |
| Reef by zetamath (on 26. June 2023, 03:35) | 115 | 97 % |
| Yin Yang Sudoku Deconstruction [9x9] by Christounet (on 7. April 2024, 09:21) | 96 | 98 % |
