(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 | |
|---|---|---|---|
 | Gravity Sudoku by Cane_Puzzles (on 15. February 2021, 16:49) | 20 |  99 % |
| Killer Sudoku by Cane_Puzzles (on 8. April 2021, 16:59) | 23 | 92 % |
| Bálint Kopasz (Tokyo 2020) by Lisztes (on 5. August 2021, 00:46) | 26 | 91 % |
| Caught Between Enemy Lines by Playmaker6174 (on 14. August 2021, 10:07) | 25 | 95 % |
| Totally Unfair 2 by Joseph nehme (on 11. December 2021, 08:24) | 23 | 96 % |
| Mutant Fillomino by au voleur! (on 19. February 2022, 18:03) | 23 | 94 % |
| T Time by EricRathbun (on 23. March 2022, 21:44) | 25 | 96 % |
| Narwhal by Xenonetix (on 29. June 2022, 22:22) | 48 | 98 % |
| Sagittarius (Killer Sudoku ft. jovi_al) by purpl (on 7. October 2022, 01:39) | 75 | 94 % |
| A Year in the Making by Polycarp (on 20. February 2023, 01:19) | 27 | 91 % |
| Irradiated (Thermo, Renban) by Chefofdeath (on 14. May 2023, 20:05) | 50 | 95 % |
| Knight's Kropki by Scruffamudda (on 12. August 2023, 06:13) | 27 | 99 % |
| High-Rise Whisper Loop by yttrio (on 15. June 2024, 02:24) | 21 | 95 % |
| Chaotic Evil by mathpesto (on 29. April 2022, 00:00) | 124 | 98 % |
| Balance = Entropy by JeremyDover (on 12. February 2022, 23:59) | 111 | 98 % |
| Pixy Stix by thoughtbyte (on 18. April 2024, 20:32) | 51 | 94 % |
| Retraces by arbitrary (on 6. September 2024, 00:07) | 60 | 96 % |
| Chaos Fillomino - Border Gaps #1 by Mark Sweep (on 7. December 2022, 10:00) | 34 | 99 % |
| Bloodcursed Arrows by ViKingPrime (on 18. February 2023, 23:00) | 32 | 93 % |
| ▚▚ Summing-Zipper-Loop ▞▞ by ElChiglia (on 2. March 2024, 07:15) | 32 | 93 % |
