(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 | |
|---|---|---|---|
 | Clockwork (Sum-Product Frame Sudoku) by Qodec (on 16. December 2025, 21:19) | 37 |  98 % |
| Yin Yang Kropki Sudoku by Phistomefel (on 19. April 2022, 10:24) | 112 | 98 % |
| Even knights fear arrows by Phistomefel (on 19. November 2020, 19:09) | 103 | 96 % |
| Irregular Whirlpool by jojo81gaming (on 6. May 2022, 15:33) | 56 | 95 % |
| Embraced by Qodec (on 6. November 2020, 18:56) | 74 | 97 % |
| Funhouse by zegres (on 12. April 2023, 14:52) | 68 | 96 % |
| Twin Chaos Sudoku II by Richard (on 30. March 2012, 12:00) | 76 | 91 % |
| Fremde Notizen by berni (on 22. May 2011, 22:48) | 17 | 98 % |
| Sum 41 - Little Killer / Arrow Sudoku by Mr.Menace (on 6. March 2021, 09:37) | 35 | 95 % |
| SneX by JayForty (on 17. March 2023, 20:28) | 19 | 91 % |
| Fourberie by ViKingPrime (on 26. May 2023, 13:30) | 29 | 96 % |
| The 12 Regions of Christmas by IcyFruit (on 15. December 2023, 10:37) | 60 | 97 % |
| That's Three In The Center by .proxz14 (on 7. June 2025, 09:21) | 51 | 96 % |
| Distant Neighbors by Knickolas (on 21. November 2025, 00:54) | 29 | 95 % |
| Anti-knight Thermo Sudoku #2 - Thermocouples by RSP (on 19. July 2020, 19:57) | 113 | 98 % |
| Little Kropkiller by Mark Sweep (on 13. November 2020, 10:00) | 44 | 96 % |
| For your big heart with lots of room by tenaliraman (on 12. February 2021, 12:45) | 45 | 97 % |
| Parity Balance by zegres (on 12. October 2021, 04:51) | 44 | 96 % |
| Pointed Knights by PotatoHead21 (on 3. March 2022, 08:30) | 50 | 95 % |
| Doppler Effect by Knickolas (on 1. February 2024, 00:14) | 46 | 96 % |
