(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 | |
|---|---|---|---|
 | Battle With The Archers 16: Judgment Trio by Playmaker6174 (on 17. September 2021, 12:12) | 52 |  97 % |
| Double Dragon (ft. Piatato) by Nordy (on 3. December 2022, 08:00) | 50 | 97 % |
| Streuung by Myxo (on 24. July 2024, 13:27) | 54 | 92 % |
| Transmission by Phistomefel (on 18. January 2023, 17:39) | 254 | 97 % |
| Anti-Knight Uprising by Scruffamudda (on 4. April 2024, 05:42) | 65 | 94 % |
| Magnet+Antimagnet-Verrückte Welt der Pole by r45 (on 11. August 2010, 16:28) | 68 | 92 % |
| Woof! by zegres (on 1. August 2022, 07:13) | 73 | 97 % |
| March of the Spiders by Niverio (on 20. October 2021, 11:58) | 74 | 94 % |
| Benebelte Nachbarschaft (FOW) by Myxo (on 19. August 2023, 05:25) | 319 | 96 % |
| Twin Killer Sudoku 2008-2009 by Richard (on 1. January 2009, 00:01) | 156 | 93 % |
| Rundweg auf der Kleinschen Flasche by flooser (on 14. November 2009, 12:52) | 54 | 91 % |
| Mannlzeug: Neinerlaa by Pyrrhon (on 24. December 2009, 18:00) | 42 | 91 % |
| RiesenRenbanKropki by Richard (on 26. March 2010, 12:00) | 70 | 90 % |
| Teamwettbewerb 2011: Rätselstern (Runde 1) by SilBer (on 30. March 2011, 20:52) | 62 | 97 % |
| Treppen (4) by BFaw (on 28. August 2012, 09:00) | 25 | 94 % |
| Scattered X-Sums Sudoku (2) by Richard (on 13. June 2014, 12:00) | 73 | 94 % |
| Krypto-X-Summen mit Zerrspiegeln by ibag (on 26. June 2019, 00:00) | 46 | 98 % |
| "Incomplete" Killer Sudoku by Greg (on 12. June 2020, 01:55) | 24 | 90 % |
| Adventskalender 2020, Türchen 16 - Twilight-Höhle by Zzzyxas (on 16. December 2020, 07:00) | 66 | 99 % |
| Sudoku Variants Series (275) - Confetti Sums Sudoku by Richard (on 1. July 2020, 00:00) | 93 | 99 % |
