(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 - S02E03: Japanische Summen / Abstände by tuace (on 16. March 2018, 15:10) | 61 |  100 % |
| Quilt by mnasti2 (on 17. May 2023, 14:45) | 62 | 96 % |
| Dynamic Dots by Niverio (on 7. March 2022, 11:56) | 64 | 96 % |
| Te Ka (Nurikabe Chaos Construction) by MaizeGator (on 16. June 2024, 03:39) | 60 | 97 % |
| 1K Sums by mathpesto (on 20. April 2022, 02:41) | 62 | 99 % |
| Chaos Construction: Corridors by vidarino (on 1. January 2022, 14:24) | 68 | 97 % |
| Revolver by Myxo (on 2. February 2023, 12:08) | 68 | 92 % |
| Equal Sudoku II by Realshaggy (on 29. April 2013, 12:23) | 74 | 94 % |
| Medusa by zetamath (on 9. August 2022, 18:01) | 75 | 96 % |
| Vice Versa (Region Sum Lines Sudoku) by Mr.Menace (on 23. June 2023, 09:30) | 88 | 93 % |
| Compression by Jay Dyer (on 1. September 2024, 21:33) | 85 | 97 % |
| Reticulated Python by mathpesto (on 27. March 2022, 04:58) | 90 | 97 % |
| Disjunction Function by Jay Dyer (on 30. April 2024, 23:20) | 109 | 98 % |
| Nonconsecutive Renban by Phistomefel (on 9. February 2022, 20:46) | 113 | 97 % |
| Tapa Distiller by yureklis (on 18. August 2009, 21:08) | 49 | 94 % |
| 4 Gleiche by Luigi (on 1. October 2009, 17:10) | 39 | 91 % |
| Das versteckte Rätsel by Luigi (on 18. March 2010, 07:39) | 14 | 92 % |
| Verflixtes ABCtje by ibag (on 28. September 2011, 16:55) | 38 | 95 % |
| April ABCtjes Monat (3) - ABCtje mit und ohne X by Richard (on 20. April 2012, 12:00) | 38 | 92 % |
| Wichtelkalender 2014 - September: Materie-Antimaterie-Rundwege by Statistica (on 1. September 2014, 00:00) | 40 | 98 % |
