(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 | |
|---|---|---|---|
 | Zeroth Law of Chromodynamics by twototenth (on 26. April 2021, 13:08) | 91 |  97 % |
| Ping Pong by antiknight (on 19. January 2025, 19:37) | 97 | 95 % |
| Lowrider by Wuschel (on 20. March 2024, 08:46) | 51 | 92 % |
| Product Ltd. by BoaConstructor (on 30. July 2020, 12:57) | 53 | 97 % |
| Fully Booked [Numbered Rooms Fillomino] by MicroStudy (on 26. January 2024, 12:26) | 105 | 97 % |
| /4 /5 by Nahileon (on 18. March 2022, 11:03) | 59 | 99 % |
| Fifteen All by Phurba (on 10. June 2024, 12:54) | 61 | 90 % |
| Streuung by Myxo (on 24. July 2024, 13:27) | 65 | 93 % |
| XV*Magic 4 by NurglesGift (on 21. December 2024, 13:33) | 147 | 96 % |
| Sudoku Variants Series (362) - Star Sums Sudoku by Richard (on 9. March 2022, 00:00) | 77 | 95 % |
| Pincers (Diagonal constraint killer sudoku) by sujoyku (on 10. September 2023, 09:32) | 104 | 95 % |
| LM Gapped Kakuro by yureklis (on 3. January 2011, 23:50) | 89 | 95 % |
| Benebelte Nachbarschaft (FOW) by Myxo (on 19. August 2023, 05:25) | 380 | 96 % |
| Rundweg auf der Kleinschen Flasche by flooser (on 14. November 2009, 12:52) | 54 | 91 % |
| Ausgedehnte Mittagspause by Richard (on 26. February 2010, 12:00) | 67 | 97 % |
| RiesenRenbanKropki by Richard (on 26. March 2010, 12:00) | 70 | 90 % |
| Renban -Kakuro 1-10 / 2 by julius64 (on 4. May 2011, 21:18) | 67 | 94 % |
| 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) | 76 | 93 % |
| Adventsportale, Teil 2 by pirx (on 9. December 2018, 12:00) | 34 | 97 % |
