(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 | |
|---|---|---|---|
 | Die Kryptos - S05E02: Teilchenzoo by tuace (on 1. September 2022, 20:22) | 19 |  99 % |
| 15 Decibels by JeremyDover (on 28. August 2022, 03:00) | 25 | 91 % |
| 6x6 Full Rank Sandwiches by Jay Dyer (on 8. October 2022, 22:29) | 23 | 91 % |
| Puzzle Plaza (relative clones + cipher sudoku) by Aspartagcus (on 16. October 2022, 11:41) | 27 | 94 % |
| Diversity 2 by Migu (on 15. February 2023, 20:08) | 51 | 90 % |
| Lux Umbra (Anti/Quadruples, Numbered Rooms) by Crusader175 (on 4. July 2023, 19:00) | 60 | 96 % |
| This + This = That by EricRathbun (on 1. November 2023, 15:55) | 44 | 97 % |
| Having A Goodlaugh by HalfBakedLunatic (on 3. December 2023, 02:38) | 47 | 91 % |
| One of these things (is not like the others) by Jrosas (on 4. April 2024, 13:44) | 20 | 93 % |
| Bittersweet Candies 4 - A (Mostly) Regular 6x6 Sudoku Pack (reworked) by Playmaker6174 (on 22. May 2024, 01:30) | 18 | 98 % |
| Psst, I'm in the Loop by Calvinball (on 9. July 2024, 15:15) | 43 | 93 % |
| Synergy by Joseph nehme (on 7. August 2021, 08:11) | 74 | 95 % |
| Krypto - Tapa by Zzzyxas (on 2. May 2021, 16:29) | 46 | 100 % |
| Jigsaw Sudoku II by Richard (on 17. March 2009, 14:44) | 119 | 90 % |
| Mafia (Chaos Construction) by Agent (on 7. November 2023, 09:00) | 115 | 98 % |
| Crossroad by Testarossa (on 18. January 2022, 20:44) | 29 | 95 % |
| Horst and Graben (Renban, German Whispers, Kropki pairs) by Bellsita (on 24. August 2022, 01:32) | 28 | 97 % |
| Zoom by matt383 (on 22. March 2023, 13:49) | 76 | 95 % |
| Wichtelkalender 2014 - April by April (on 1. April 2014, 00:00) | 36 | 98 % |
| Wichtel 2020 (6): Rundweg "Fünf Jahreszeiten" by wichtel (on 27. May 2021, 20:02) | 37 | 99 % |
