(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 | |
|---|---|---|---|
 | Wall Sudoku by Phistomefel (on 22. December 2021, 23:59) | 108 |  99 % |
| The Sudokutown Murders by Nordy (on 19. February 2022, 04:40) | 73 | 99 % |
| Constantinople by jwsinclair (on 4. February 2026, 21:13) | 52 | 96 % |
| Chaos Construction: 2nd Region X-Sums #2 (9x9) by Jesper (on 5. April 2022, 11:15) | 70 | 100 % |
| Medieval Upheaval 2 by Nordy (on 6. January 2023, 08:00) | 65 | 98 % |
| Thermo Killer Sudoku X by Jeet Sampat (on 10. November 2021, 23:56) | 27 | 95 % |
| Gonna (Kouchoku) by Wessel Strijkstra (on 21. October 2022, 12:39) | 24 | 95 % |
| Double Fireworks by antiknight (on 9. January 2023, 07:23) | 50 | 94 % |
| I Only Have Eyes For You by juggler (on 24. May 2024, 17:47) | 58 | 98 % |
| Some Quads Somedoku by blackjackfitz (on 5. February 2025, 03:56) | 35 | 96 % |
| Atrocious Destruction by NXTMaster (on 14. November 2025, 00:00) | 27 | 99 % |
| Turn 1: Parity Yin Yang by yttrio (on 26. October 2024, 02:10) | 43 | 96 % |
| Anti-Knight Killer Sudoku by trivial171 (on 4. May 2020, 00:46) | 57 | 95 % |
| Always on the loockout ! [Lockout Lines Deconstruction] by Christounet (on 12. August 2023, 00:09) | 49 | 99 % |
| Suguru Chaos Deconstruction: Quadruples by Niverio (on 3. May 2022, 12:39) | 95 | 98 % |
| Tower Defence #2 by Feadoor (on 17. March 2020, 09:40) | 15 | 95 % |
| Snake Sum Sudoku 3 by Quarterthru (on 4. July 2020, 00:00) | 29 | 97 % |
| Poisoned Little Killer by SenatorGronk (on 24. September 2020, 04:50) | 14 | 98 % |
| Trigonometry (Killer Sudoku) by emmettcito (on 26. April 2021, 20:04) | 30 | 95 % |
| Even Numbers are Social Distancing by swaroop2012 (on 3. May 2021, 21:15) | 13 | 91 % |
