(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 | |
|---|---|---|---|
 | Soap Opera by Jay Dyer (on 28. January 2024, 21:19) | 39 |  93 % |
| Wanddeko by Myxo (on 8. October 2025, 17:39) | 43 | 92 % |
| Kurotto Killer Sudoku by KNT (on 29. July 2022, 04:21) | 72 | 95 % |
| Roller Coaster mit Extras 16 by Uhu (on 5. March 2020, 07:34) | 29 | 99 % |
| Star-Crossed Sandwiches by DarthParadox (on 25. January 2024, 01:26) | 31 | 92 % |
| Double Loop Japanese Sums by Agent (on 26. February 2024, 09:00) | 32 | 96 % |
| Tetropolis by sfushidahardy (on 4. October 2024, 17:18) | 31 | 99 % |
| Satan Whispers by damasosos92 (on 19. February 2024, 16:42) | 39 | 92 % |
| There is still life in my sandwich... by Sktx (on 15. May 2021, 00:49) | 19 | 94 % |
| 1-N Chaos Deconstruction: Whisper / Renban / Between by KNT (on 14. May 2022, 16:49) | 56 | 95 % |
| Watermill by lerroyy (on 15. May 2022, 22:44) | 29 | 97 % |
| Knot in the Crosshairs by antiknight (on 13. December 2022, 23:40) | 31 | 95 % |
| Second Region X-Sums Chaos #2 by Elliptical (on 18. January 2023, 22:58) | 18 | 94 % |
| Ciphered Japanese Sums - KNT by Niverio (on 22. April 2023, 12:18) | 43 | 99 % |
| Liar U-Bahn by Myxo (on 8. June 2023, 12:47) | 37 | 99 % |
| Candy Corner (ft. grkles) by Niverio (on 10. November 2023, 18:53) | 37 | 92 % |
| Medusa's Lair by XeonRisq (on 5. April 2024, 20:00) | 20 | 100 % |
| Big Bad Wolf by IcyFruit (on 10. April 2025, 14:24) | 106 | 98 % |
| Hotel California by fjam (on 2. April 2025, 21:51) | 21 | 95 % |
| Rainy Day Sudoku 12 (squared) & 35 by joecat (on 30. July 2020, 11:20) | 91 | 99 % |
