(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 | |
|---|---|---|---|
 | Escape the Programmer's Vortex by Oddlyeven (on 31. March 2023, 02:45) | 14 |  98 % |
| Sherlock's advice to the good Dr. Watson by HalfBakedLunatic (on 4. June 2023, 15:36) | 79 | 98 % |
| X-Secret by Prof.Dori (on 20. June 2023, 23:50) | 24 | 92 % |
| Stolen Whispers by Paquet Voleur (on 1. July 2023, 22:36) | 35 | 91 % |
| Sudo-cuboid by ThePedallingPianist (on 28. July 2023, 16:38) | 20 | 92 % |
| Appaloosa by Die Hard (on 14. August 2023, 08:43) | 38 | 94 % |
| Tetris Ain't In My Genes by Groktilian (on 3. October 2023, 16:00) | 25 | 96 % |
| Mods & Quads by marty_sears (on 14. October 2023, 00:11) | 56 | 93 % |
| Tricky-Tracky by Sumanta(ANU) (on 9. December 2023, 09:45) | 43 | 95 % |
| Battle of Evermore by kuraban (on 17. February 2024, 03:03) | 140 | 96 % |
| King's Siege by Sniglett (on 10. March 2024, 23:05) | 24 | 97 % |
| Propeller by Scojo (on 30. April 2024, 10:53) | 14 | 94 % |
| Full House by juggler (on 20. June 2024, 01:17) | 84 | 97 % |
| sphinx of black quartz by aqjhs (on 4. October 2024, 01:40) | 45 | 93 % |
| Shade Your Own Puzzle: Fillomino vs Cave ft. Parity #1 (8x8) by Playmaker6174 (on 19. October 2024, 10:30) | 26 | 99 % |
| Vibrations (Killer, Thermo) by Niverio (on 30. September 2023, 17:01) | 127 | 95 % |
| The Big Zipper by marty_sears (on 1. November 2023, 14:04) | 122 | 95 % |
| Dustpan (Disjoint parity sweeper sudoku) by Qodec (on 23. February 2023, 13:00) | 121 | 97 % |
| Archer's Prologue: Positive Mindset by Playmaker6174 (on 13. November 2021, 06:05) | 55 | 98 % |
| The Thing by mathpesto (on 16. October 2022, 04:48) | 50 | 91 % |
