(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 | |
|---|---|---|---|
 | Double Arrow Sudoku by tesseralis (on 30. June 2023, 03:44) | 24 |  90 % |
| Another “One of These Things” by Jrosas (on 4. April 2024, 16:47) | 23 | 92 % |
| Slitherlink Region Sum Hexuro by Nell Gwyn (on 22. July 2024, 07:10) | 21 | 98 % |
| Out of the Loop by oskode (on 15. May 2025, 10:20) | 26 | 97 % |
| Moo's Final Boss by Laake (on 19. April 2025, 09:26) | 38 | 94 % |
| Portal Dolmen 2 (Anti-Knight, German Whispers, ESL) by juddimal (on 24. May 2025, 22:30) | 66 | 93 % |
| The "No-9 Line" by Timpanist (on 7. February 2026, 08:23) | 39 | 97 % |
| Torn Apart by Black_Doom (on 18. August 2024, 11:58) | 67 | 96 % |
| Whispers of Doom 4 by NurglesGift (on 12. December 2025, 18:56) | 71 | 95 % |
| Asterisk (palindrome killer sudoku x) by clover (on 23. November 2020, 16:01) | 88 | 94 % |
| X Gon' Give It To Ya by Justalilguy (on 7. February 2025, 17:11) | 45 | 96 % |
| to the minimal great hidden by aqjhs (on 30. December 2024, 01:23) | 87 | 93 % |
| Sandwich/Killer Sudoku - Find x Part 3 by ProwlingTiger (on 27. May 2020, 20:00) | 27 | 94 % |
| Killer Sudoku 311 by Quarterthru (on 20. March 2021, 12:00) | 33 | 96 % |
| Yin Yang Arrows by Schwupel (on 23. September 2022, 19:36) | 136 | 99 % |
| Battle With The Archers 38: The War of Three Worlds by Playmaker6174 (on 10. April 2023, 05:37) | 53 | 96 % |
| Let It Go (Nurikabe/Skyscraper/Fortress) by MaizeGator (on 24. June 2024, 00:20) | 29 | 98 % |
| Cage Match by silent_rob (on 29. July 2024, 08:00) | 29 | 93 % |
| Negative Space by ViKingPrime (on 26. December 2024, 02:35) | 31 | 94 % |
| Chainsaw by chameleon (on 22. April 2025, 09:10) | 27 | 95 % |
