(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 | |
|---|---|---|---|
 | Dynamic Quiver by Niverio (on 22. November 2023, 18:41) | 50 |  98 % |
| Augur's gift (Japanese sums/Mean mini/Kropki) by dumediat (on 24. May 2024, 03:09) | 34 | 97 % |
| The Curse of King Minos by Allagem (on 17. November 2024, 07:06) | 139 | 97 % |
| X*Cage by NurglesGift (on 27. November 2024, 18:14) | 144 | 94 % |
| CTC U-Bahn Guest Series Extras: Extra Region U-Bahn by KNT (on 19. May 2025, 11:54) | 44 | 97 % |
| There's a 1 at 3:00 by Md88keys (on 30. August 2025, 20:52) | 24 | 94 % |
| Modder on the Dancefloor by Sotehr (on 15. November 2025, 01:00) | 15 | 91 % |
| Stolen Numerals XVII by NurglesGift (on 15. July 2024, 16:24) | 125 | 97 % |
| Every Third Knight by JeremyDover (on 4. February 2022, 17:00) | 91 | 93 % |
| Point the Silent Path by Niverio (on 18. June 2024, 09:25) | 65 | 97 % |
| Do I Sing Her End? by juddimal (on 8. July 2024, 22:54) | 74 | 95 % |
| Canadian Whispers by Mojo872 (on 15. December 2021, 07:13) | 57 | 96 % |
| Steamed Hams by Perladel (on 12. October 2022, 13:03) | 68 | 96 % |
| Six 6x6-sudoku pack by Qodec (on 26. June 2021, 23:10) | 51 | 98 % |
| Ghost Cages by juggler (on 19. July 2024, 03:38) | 100 | 94 % |
| whisperwhisperwhisperwhisper by twototenth (on 18. January 2022, 08:00) | 87 | 94 % |
| Whispering Isles by yttrio (on 18. January 2025, 01:44) | 90 | 97 % |
| Mnmle Mgntplttn by berni (on 11. April 2016, 14:13) | 36 | 98 % |
| Mehrdeutige Rätsel - U-Bahn unter Hochhäusern by Zzzyxas (on 30. November 2019, 17:28) | 38 | 99 % |
| SudokOops by Abdul the Killer (on 2. November 2022, 16:52) | 41 | 90 % |
