(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 | |
|---|---|---|---|
 | Jet Lag (Dynamic Fog of War, Chaos Construction) by DubiousMobius (on 6. December 2024, 04:21) | 12 |  95 % |
| Chaotic Wrogn [Tribute to DiMono] by Undar_Beyond (on 28. December 2020, 08:14) | 89 | 97 % |
| Suguru Chaos Deconstruction: The Mop (Between Lines) by crispy16 (on 26. May 2022, 20:43) | 33 | 97 % |
| Candy Corner (ft. grkles) by Niverio (on 10. November 2023, 18:53) | 34 | 93 % |
| Satan Whispers by damasosos92 (on 19. February 2024, 16:42) | 35 | 91 % |
| Arrow/Group Sum Sudoku by ahaupt (on 10. July 2020, 21:53) | 66 | 99 % |
| Wichtel 2012 (1): Der verwirrte Weihnachtsmann by wichtel (on 18. March 2013, 21:30) | 41 | 99 % |
| Whirlpool by FryTheGuy (on 26. August 2021, 17:16) | 23 | 96 % |
| Ten-Oh (10-Lines sudoku) by Qodec (on 21. May 2023, 18:31) | 69 | 97 % |
| Castle Wall Delta #2 (15x15) by Jesper (on 1. June 2021, 08:38) | 50 | 100 % |
| Triple Japasu IV - Pin7guins nightmare by Luigi (on 23. May 2018, 09:22) | 29 | 95 % |
| Liar Japanese Sums #7 - Ciphered Nurikabe by Niverio (on 1. December 2023, 00:53) | 39 | 100 % |
| Disconnected Counting Chaos by wooferzfg (on 9. June 2024, 05:16) | 34 | 96 % |
| Chaos Construction: Snake by MagnusJosefsson (on 5. June 2021, 13:58) | 42 | 100 % |
| Primesssweeper: Epictia by Xenonetix (on 10. March 2022, 17:17) | 42 | 99 % |
| Parity Party XXV, "Gray's Anatomy" by glum_hippo (on 29. December 2022, 03:46) | 19 | 96 % |
| Renrenbanban by DarthParadox (on 25. April 2023, 17:54) | 45 | 97 % |
| Cavino Wisteria by PrimeWeasel (on 9. November 2024, 09:48) | 22 | 100 % |
| Trapped by a Killer by SudokuExplorer (on 25. November 2021, 00:00) | 58 | 96 % |
| Adventsportale, Teil 4 by pirx (on 23. December 2018, 12:00) | 45 | 99 % |
