(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 | |
|---|---|---|---|
 | Deflation by jwsinclair (on 13. December 2022, 20:42) | 52 |  95 % |
| Intergrowth (Psycho Look-and-Say/Entropic lines/Modular lines) collab with bellsita by dumediat (on 25. February 2023, 12:51) | 44 | 99 % |
| Stepping Stone Sandwiches by RockyRoer (on 1. April 2024, 18:36) | 40 | 95 % |
| Japanisches Summen by berni (on 4. September 2015, 21:14) | 30 | 98 % |
| Ship's Wheel by Qodec (on 19. February 2022, 11:09) | 64 | 98 % |
| Renban Plasters by antiknight (on 4. April 2024, 18:32) | 38 | 94 % |
| Kuromasudoku by Phistomefel (on 26. November 2020, 20:18) | 81 | 99 % |
| Sherlock's advice to the good Dr. Watson by HalfBakedLunatic (on 4. June 2023, 15:36) | 91 | 98 % |
| Odd Blockade Runners by JeffWajes (on 17. April 2023, 19:44) | 108 | 95 % |
| Die Kryptos - S03E05: Spiral City Construction by tuace (on 30. October 2018, 10:14) | 50 | 98 % |
| Cave / Nurikabe by Jesper (on 1. November 2020, 16:50) | 91 | 99 % |
| Food Killer by Mark Sweep (on 27. November 2020, 10:00) | 25 | 98 % |
| The Disjointed Cube by Wecoc (on 8. January 2021, 01:57) | 58 | 96 % |
| Four Corners (Arrow Killer X) by tallcat (on 13. May 2021, 15:02) | 99 | 98 % |
| Classic-style Killer Sudoku by Jeet Sampat (on 27. January 2022, 22:59) | 35 | 95 % |
| Sum Hope (Sum Lines) by Chilly (on 26. April 2022, 11:23) | 50 | 97 % |
| The Friendly Stars by Crusader175 (on 10. January 2023, 15:00) | 29 | 98 % |
| Death Stare by Die Hard (on 5. February 2023, 21:21) | 28 | 93 % |
| X-Secret by Prof.Dori (on 20. June 2023, 23:50) | 27 | 91 % |
| Tetris Ain't In My Genes by Groktilian (on 3. October 2023, 16:00) | 30 | 93 % |
