(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 | |
|---|---|---|---|
 | Myriapods by marty_sears (on 17. August 2025, 00:14) | 355 |  97 % |
| Sudoku Variants Series (302) - Y-Sums Sudoku by Richard (on 6. January 2021, 00:00) | 107 | 97 % |
| Penghu County by Myxo (on 13. May 2025, 18:44) | 143 | 97 % |
| Killer Pyramide by tuace (on 3. October 2013, 02:30) | 69 | 94 % |
| Sudoku Variants Series (375) - Odd-Even Thermometers by Richard (on 13. July 2022, 02:00) | 117 | 96 % |
| Peas Offering by Andrewsarchus (on 6. November 2025, 17:27) | 56 | 97 % |
| U-Bahn unter Hochhäusern (Teil 4) by Zzzyxas (on 31. March 2012, 16:17) | 76 | 97 % |
| Killer Sudoku by Greg (on 14. June 2020, 21:04) | 42 | 92 % |
| Pandora's BoXXX by twototenth (on 13. December 2022, 08:00) | 43 | 94 % |
| Switch-O-Renban by Ridhwan (on 5. May 2024, 11:06) | 38 | 95 % |
| Incongruity by zetamath (on 20. August 2024, 20:36) | 46 | 96 % |
| Decoy Snail by ViKingPrime (on 19. May 2025, 23:45) | 175 | 98 % |
| Rank Up 20.jv - Mod 3 by vitaminz (on 10. October 2025, 14:58) | 38 | 91 % |
| The Yellow Jester (with aqjhs) by ChinStrap (on 16. October 2025, 14:20) | 40 | 97 % |
| The Triple Crown by KMD (on 21. April 2026, 19:27) | 45 | 98 % |
| CtC-Tribute-Thermo-Sudoku by olima (on 15. August 2020, 23:42) | 63 | 91 % |
| Thermo X Sudoku by Phistomefel (on 2. December 2020, 20:08) | 156 | 93 % |
| # (Arrow Sudoku) by Cane_Puzzles (on 4. June 2021, 17:00) | 26 | 97 % |
| Revolution by Stavros96 (on 18. September 2021, 10:54) | 30 | 97 % |
| Canadian Whispers by Mojo872 (on 15. December 2021, 07:13) | 58 | 96 % |
