(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 | |
|---|---|---|---|
 | Everything is Stavros96 (Palindrome Killer) by Stavros96 (on 14. January 2021, 07:51) | 62 |  98 % |
| Throwing Shade by tesseralis (on 19. June 2022, 01:25) | 27 | 98 % |
| Poshley Heights by wooferzfg (on 17. May 2023, 06:04) | 31 | 99 % |
| Public Secrecy by shadow-nexus (on 13. January 2024, 00:54) | 34 | 93 % |
| Mystery Cages Somedoku by blackjackfitz (on 18. September 2024, 01:13) | 32 | 90 % |
| Adventsportale, Teil 3 by pirx (on 16. December 2018, 12:00) | 37 | 98 % |
| XY-Cages by glum_hippo (on 1. May 2022, 06:05) | 36 | 96 % |
| Sealed Fate by Xendari (on 15. August 2022, 05:55) | 36 | 96 % |
| X-Sumaguni Sudoku by rockratzero (on 15. April 2023, 08:22) | 36 | 95 % |
| Tricky-Tracky by Sumanta(ANU) (on 9. December 2023, 09:45) | 44 | 95 % |
| Buffet by zetamath (on 20. July 2023, 06:51) | 180 | 98 % |
| Six-pack Linked Sudokus #3 by Genomico (on 25. February 2021, 03:49) | 43 | 91 % |
| MP: Region Sum Lines Fillomino by Myxo (on 28. January 2023, 14:28) | 42 | 98 % |
| Manifold by Oddlyeven (on 28. April 2024, 15:43) | 45 | 97 % |
| Twin Killer II by Richard (on 25. March 2009, 10:19) | 144 | 95 % |
| Killer Knights by Cane_Puzzles (on 29. October 2021, 19:58) | 59 | 97 % |
| June Pentomino Month (3) - Filled Liar Loop by Richard (on 21. June 2013, 12:00) | 53 | 97 % |
| ABC-Box mit Hochhauskern (2) by ibag (on 3. July 2013, 08:05) | 64 | 99 % |
| Anti3sis (Yin Yang Doubler Sudoku) by Agent (on 8. November 2022, 09:00) | 83 | 98 % |
| Identitätskrise (Variables Tapasyu 2) by usp (on 8. March 2014, 16:20) | 58 | 96 % |
