(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 | |
|---|---|---|---|
 | Invisible Killers by yttrio (on 10. March 2023, 21:32) | 34 |  97 % |
| Candy Corner (ft. grkles) by Niverio (on 10. November 2023, 18:53) | 33 | 93 % |
| Steel Vengeance (Chaos Deconstruction Rollercoaster) by tallcat (on 2. September 2024, 08:00) | 33 | 96 % |
| 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 % |
| Enantiodromia (Yin-Yang Chaos Construction, 8x8) by thoughtbyte (on 3. August 2022, 00:05) | 23 | 99 % |
| Manhattan by wooferzfg (on 17. August 2023, 02:49) | 20 | 99 % |
| Japanese Japanese Sums Sums #1 by The Book Wyrm (on 30. November 2023, 22:11) | 25 | 97 % |
| Arrow/Group Sum Sudoku by ahaupt (on 10. July 2020, 21:53) | 64 | 99 % |
| Triple Japasu IV - Pin7guins nightmare by Luigi (on 23. May 2018, 09:22) | 29 | 95 % |
| Thinkies (Miracle Chaos Construction) by purpl (on 12. June 2022, 18:12) | 32 | 98 % |
| Kurotto Killer Sudoku by KNT (on 29. July 2022, 04:21) | 66 | 96 % |
| Ten-Oh (10-Lines sudoku) by Qodec (on 21. May 2023, 18:31) | 67 | 97 % |
| Chaotic Wrogn [Tribute to DiMono] by Undar_Beyond (on 28. December 2020, 08:14) | 82 | 99 % |
| Chaos Construction: Snake by MagnusJosefsson (on 5. June 2021, 13:58) | 41 | 100 % |
| 4D Killer Sudoku by FryTheGuy (on 11. October 2021, 22:29) | 21 | 100 % |
| Primesssweeper: Epictia by Xenonetix (on 10. March 2022, 17:17) | 42 | 99 % |
| The last call by filuta (on 18. April 2022, 17:38) | 23 | 93 % |
| Suguru Chaos Deconstruction: The Mop (Between Lines) by crispy16 (on 26. May 2022, 20:43) | 31 | 98 % |
| Four Alien Theorem (Build Your Own Killer Sudoku) by Agent (on 7. April 2023, 09:00) | 41 | 99 % |
