(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 | |
|---|---|---|---|
 | Three Arrows by Onion Suit (on 5. May 2021, 02:31) | 24 |  94 % |
| Wave Sudoku by Vebby (on 26. May 2021, 19:06) | 18 | 95 % |
| Diamonds by abed hawila (on 6. June 2021, 17:16) | 20 | 96 % |
| Forwards & Backwards by zetamath (on 12. July 2021, 23:43) | 46 | 93 % |
| Norinori Castle Wall by SudokuExplorer (on 11. March 2022, 17:30) | 20 | 94 % |
| Rounded Repulsion by Qril (on 9. June 2022, 02:04) | 21 | 96 % |
| Mineshweepa by mnasti2 (on 10. August 2022, 20:45) | 24 | 94 % |
| Second Region X-Sums Chaos by Elliptical (on 20. November 2022, 21:22) | 44 | 98 % |
| Double Jointed by 99%Sneaky (on 2. September 2023, 19:00) | 23 | 93 % |
| Dissident Factions by meggen033 (on 28. January 2024, 06:14) | 35 | 91 % |
| el quinto sol by aqjhs (on 27. November 2024, 05:00) | 23 | 96 % |
| Turn to Stone by Andrewsarchus (on 29. October 2025, 06:14) | 18 | 97 % |
| Blokus by NotVeryNeat (on 5. February 2026, 08:17) | 22 | 91 % |
| Pentominous Sum Lines by Xendari (on 19. October 2023, 23:22) | 63 | 97 % |
| Cavalry Archer (Anti-Knight Arrow Sudoku) by Phistomefel (on 2. June 2021, 21:09) | 199 | 97 % |
| Ghost Digit by jwsinclair (on 15. October 2021, 19:25) | 31 | 95 % |
| Kropki XV Sudoku - Progressive Power-Up by DiMono (on 6. January 2022, 18:46) | 30 | 93 % |
| Ratio (-) Arrow Sudoku by Florian Wortmann (on 10. April 2022, 16:06) | 25 | 91 % |
| Double or Nothing by Oddlyeven (on 14. December 2022, 17:06) | 23 | 99 % |
| Shady Combination #1: Cave, Pentominos, Slitherlink, Snake by Myxo (on 9. January 2023, 15:33) | 50 | 99 % |
