(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 | |
|---|---|---|---|
 | Lucerna (Large Myopia with Small Cave-Sudoku) by sfushidahardy (on 20. September 2025, 18:46) | 29 |  98 % |
| Om Nom by Neokart (on 31. December 2025, 16:52) | 24 | 90 % |
| EnTropic Islands by Paletron (on 1. October 2023, 11:27) | 151 | 98 % |
| To The Skies by Piatato (on 14. October 2021, 22:25) | 67 | 97 % |
| Rorschach (Thermo) by tallcat (on 23. June 2022, 17:06) | 67 | 95 % |
| Siphon (Region Sum Lines) by tallcat (on 11. August 2022, 08:00) | 128 | 99 % |
| Threads of Silence by Prof.Dori (on 21. September 2025, 02:51) | 61 | 93 % |
| Killer Sandwich by Alexander Rappa (on 31. October 2020, 19:16) | 46 | 99 % |
| Roman Architecture by Scruffamudda (on 15. October 2024, 06:42) | 55 | 94 % |
| Lost Village (Lost and Found #5) by .proxz14 (on 8. March 2025, 13:32) | 152 | 96 % |
| Das Krypto-ABC-tje des Außerirdischen by ibag (on 22. August 2012, 14:56) | 31 | 96 % |
| Die Kryptos - S04E06: Kariertes Fillomino (Variante) by tuace (on 21. January 2020, 08:06) | 33 | 98 % |
| Scorpion by udukos (on 1. January 2022, 14:10) | 68 | 95 % |
| Corner Piece by pieguy (on 26. February 2023, 21:07) | 35 | 95 % |
| Elementary by igniteice (on 21. December 2023, 02:40) | 41 | 91 % |
| JS Whisper Yin Yang by yttrio (on 3. January 2026, 02:10) | 66 | 99 % |
| Samurai-Sudoku mit Varianten by Pingu (on 6. December 2019, 02:33) | 61 | 90 % |
| Not too High, Not too Low by Cane_Puzzles (on 18. March 2023, 19:57) | 61 | 96 % |
| Japanese Sums #3: Reef by Myxo (on 17. May 2023, 21:10) | 59 | 95 % |
| These Aren't The Circles You're Looking For by Jay Dyer (on 7. August 2024, 00:02) | 81 | 97 % |
