(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 | |
|---|---|---|---|
 | Which Blare? by XeonRisq (on 28. August 2022, 22:00) | 15 |  92 % |
| Conundrum by Andrewsarchus (on 18. October 2022, 05:46) | 15 | 98 % |
| Pawn's SET Piece (6x6) by mormagli (on 23. October 2022, 02:48) | 14 | 98 % |
| Broken Entropy by SeveNateNine (on 23. March 2023, 00:46) | 14 | 95 % |
| Archer's Heart by SudokuExplorer (on 5. October 2021, 00:00) | 46 | 98 % |
| Sandwich Battle 2 by Strosahl (on 22. September 2020, 19:22) | 35 | 94 % |
| Covert Confinement by SSG (on 21. January 2022, 07:01) | 38 | 97 % |
| Subway Roundabout by Niverio (on 21. August 2024, 22:25) | 34 | 97 % |
| Cagey Architects (Dynamic FoW) by gdc (on 20. December 2024, 15:17) | 178 | 97 % |
| Die Kryptos - S02E06: Summenbild Rundweg / Sudoku by tuace (on 16. March 2018, 15:10) | 39 | 100 % |
| O vs. X by ICHTUES (on 4. July 2021, 06:00) | 20 | 93 % |
| Five Stories by SSG (on 6. January 2022, 07:15) | 22 | 93 % |
| And Then There Were None by fjam (on 23. April 2022, 20:16) | 25 | 91 % |
| Colorguru Chaos Deconstruction: Palindromes by crispy16 (on 17. June 2022, 19:42) | 39 | 99 % |
| Lucky Arrows by PotatoHead21 (on 9. August 2022, 22:28) | 25 | 93 % |
| Beacons and Towers by Elliptical (on 18. September 2022, 21:21) | 20 | 97 % |
| Arrow Sudoku X - Third time's the charm by udukos (on 3. April 2021, 21:26) | 51 | 96 % |
| Fractional Dimension (Chaos Construction) by Chilly (on 14. June 2022, 14:33) | 50 | 98 % |
| Still no cage totals... - Odd/Even Killer Sudoku (#6) by Mr.Menace (on 14. May 2021, 23:02) | 28 | 95 % |
| Denver by ICHTUES (on 17. July 2022, 06:00) | 116 | 96 % |
