(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 | |
|---|---|---|---|
 | Cryptic Snakewords by marty_sears (on 26. January 2024, 02:34) | 50 |  98 % |
| Position Sums mit Pfeilen, "Air Opossum" by glum_hippo (on 24. February 2021, 06:00) | 24 | 93 % |
| Thermo Killer Sudoku X by Jeet Sampat (on 10. November 2021, 23:56) | 27 | 95 % |
| Double Fireworks by antiknight (on 9. January 2023, 07:23) | 50 | 94 % |
| Bolts by antiknight (on 28. March 2023, 14:49) | 32 | 97 % |
| Slitherbahn by KNT (on 5. August 2024, 09:00) | 52 | 100 % |
| demasiados bichos by aqjhs (on 25. July 2025, 00:14) | 28 | 96 % |
| The Sudokutown Murders by Nordy (on 19. February 2022, 04:40) | 76 | 99 % |
| 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 % |
| Medieval Upheaval 2 by Nordy (on 6. January 2023, 08:00) | 68 | 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 % |
| Angler by Dandelo (on 27. July 2021, 22:20) | 12 | 95 % |
| Bose-Einstein Condensate (S-cells) by purpl (on 18. January 2022, 17:34) | 24 | 99 % |
| Suguru Chaos Deconstruction: Quadruples by Niverio (on 3. May 2022, 12:39) | 99 | 98 % |
| Friendly Doublers by AstralSky (on 1. February 2023, 18:41) | 14 | 95 % |
