(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 | |
|---|---|---|---|
 | Time to Color by EricRathbun (on 16. October 2022, 21:17) | 15 |  90 % |
| A Blind Killer by bodemeister (on 17. January 2023, 08:29) | 12 | 95 % |
| Broken Entropy by SeveNateNine (on 23. March 2023, 00:46) | 11 | 98 % |
| Doppler Effect (Roller Coaster) by Agent (on 3. January 2024, 09:00) | 38 | 98 % |
| Decapitated (Chaos Construction) by Black_Doom (on 14. January 2024, 18:48) | 71 | 97 % |
| Friends² by JoWovrin (on 1. November 2021, 19:16) | 60 | 100 % |
| Portal Sum - Little Killer Sudoku by Playmaker6174 (on 22. April 2022, 16:46) | 19 | 96 % |
| Consecutive Ladder by Cane_Puzzles (on 17. January 2023, 09:33) | 47 | 98 % |
| I Fell Down The Waterfall by LittleNightmaresLady (on 6. May 2023, 18:04) | 21 | 91 % |
| F-Puzzle by PulverizingPancake (on 16. April 2021, 03:40) | 35 | 92 % |
| Kakuro S-Cells Loop [Secret Satan #1] by Christounet (on 25. January 2024, 11:57) | 27 | 98 % |
| Bunte Geburtstagstorte by Luigi (on 4. November 2014, 00:56) | 31 | 96 % |
| RGB by Qodec (on 11. September 2021, 14:17) | 79 | 97 % |
| Long range archery by filuta (on 1. September 2022, 18:20) | 25 | 98 % |
| Lookie Lookie (Doubler/Look-and-say/Renban) by dumediat (on 2. September 2022, 03:53) | 17 | 98 % |
| Looking for Phisto by EPH (on 22. February 2023, 18:29) | 30 | 95 % |
| Border Count Pentominous by Gliperal (on 13. March 2023, 00:08) | 32 | 96 % |
| Meidjuluk Star Battle by Grausbert (on 19. June 2023, 15:30) | 19 | 95 % |
| Happy Birthday Piatato: A Doppelblock U-Bahn by wisty (on 30. August 2023, 03:33) | 31 | 99 % |
| Call My Bluff (2 Truths, 1 Lie Sudoku) by tallcat (on 16. October 2023, 07:00) | 81 | 97 % |
