(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 | |
|---|---|---|---|
 | Sudoku X Weirdity by Jeet Sampat (on 18. April 2022, 03:14) | 31 |  92 % |
| Portal Killer by crispy16 (on 11. June 2022, 04:29) | 28 | 96 % |
| Equal Sum Arrows by Sumanta(ANU) (on 7. June 2023, 11:21) | 29 | 93 % |
| Numbers in Cages in Regions in a 6x6 by PeterJoe (on 29. September 2023, 14:58) | 30 | 97 % |
| Leaving Las Vegas by SkepticalMario (on 16. November 2024, 00:13) | 35 | 93 % |
| Penghu County by Myxo (on 13. May 2025, 18:44) | 141 | 97 % |
| Sudoku Variants Series (033) - Little Killer by Richard (on 15. July 2014, 00:00) | 181 | 95 % |
| Decoy Snail by ViKingPrime (on 19. May 2025, 23:45) | 169 | 98 % |
| Nexus [Fog of War Sudoku] by wisty (on 6. March 2023, 02:14) | 88 | 91 % |
| Milchstraße (Sektor 23F) by usp (on 5. November 2014, 00:00) | 48 | 98 % |
| Half and Half by Black_Doom (on 2. March 2025, 10:12) | 42 | 94 % |
| Easter Eggs by Jobo (on 31. March 2024, 09:09) | 66 | 98 % |
| Stealth (feat. tallcat) by the_cogito (on 11. November 2022, 04:10) | 87 | 95 % |
| Intersections by IcyFruit (on 8. February 2024, 14:27) | 127 | 98 % |
| Killer Pyramide by tuace (on 3. October 2013, 02:30) | 68 | 94 % |
| Sandwich Sudoku--Odd or Even(CSC2020 Leftover) by cdwg2000 (on 21. October 2020, 16:06) | 17 | 96 % |
| Sudoku-GP Leftover (1): Liar-X-Sums by JonaS2010 (on 27. October 2020, 17:43) | 39 | 98 % |
| N-Sums Sudoku by ICHTUES (on 28. February 2021, 06:00) | 14 | 90 % |
| Taco Bowl 2 - More Meat by DiMono (on 14. March 2021, 19:30) | 31 | 98 % |
| Handshake by Asimir (on 13. May 2021, 03:10) | 19 | 94 % |
