(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 | |
|---|---|---|---|
 | Hugging Arrows (Disjoint Arrow Sudoku) by EliasKar (on 26. February 2021, 15:11) | 25 |  97 % |
| 真笑Puzzles034--69Sandwiches (7)--XY Index2 by cdwg2000 (on 14. March 2021, 09:51) | 19 | 100 % |
| Sudokurotto by Phistomefel (on 15. September 2021, 07:39) | 123 | 99 % |
| Interjunction by MavericksJD (on 8. January 2022, 05:47) | 24 | 94 % |
| Archa by zetamath (on 10. January 2022, 06:28) | 101 | 99 % |
| Watch my Sandwich by Angelo (on 7. March 2022, 18:22) | 20 | 97 % |
| Trisection by jsmirob (on 15. February 2022, 22:39) | 23 | 93 % |
| Chaos Snakes by Dag H (on 31. March 2023, 03:35) | 23 | 91 % |
| Cobweb by antiknight (on 29. June 2023, 19:28) | 22 | 91 % |
| Build Your Own Killer: Master Designer by Playmaker6174 (on 15. August 2023, 06:00) | 63 | 95 % |
| Squishy Deconstruction by Oddlyeven (on 8. June 2024, 14:52) | 20 | 96 % |
| Drift by zetamath (on 11. October 2024, 18:56) | 41 | 99 % |
| Turn 1: Parity Yin Yang by yttrio (on 26. October 2024, 02:10) | 45 | 96 % |
| Similar Circles by Md88keys (on 31. October 2025, 05:13) | 25 | 91 % |
| Liescrapers by marty_sears (on 12. January 2025, 18:39) | 120 | 95 % |
| The Final Move by kolot (on 28. October 2021, 05:01) | 42 | 98 % |
| Chaos Construction: Miracle on 64 Cells by Playmaker6174 (on 18. January 2025, 00:00) | 87 | 99 % |
| fragmental ablation by aqjhs (on 3. February 2026, 02:03) | 45 | 94 % |
| Entropy miracle 7 by fractalminding (on 7. March 2026, 09:50) | 46 | 95 % |
| Semi-miraculous Sudoku by clover (on 26. September 2020, 13:00) | 53 | 92 % |
