(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 | |
|---|---|---|---|
 | LM-Training: Japanisches Summen-Masyu by rob (on 4. June 2018, 23:22) | 43 |  93 % |
| Shikaku Fillomino #2 (9x9) by the_cogito (on 15. September 2022, 15:41) | 44 | 96 % |
| Lawnmover by wuc (on 13. April 2025, 14:37) | 97 | 97 % |
| A Shot in the Dark (Whisper Arrow) by tallcat (on 11. November 2021, 15:28) | 49 | 97 % |
| Double or Half (killer sudoku + star battle) by Al Fresco (on 14. November 2022, 21:31) | 43 | 95 % |
| Foggy Fillomino by Die Hard (on 31. December 2024, 23:24) | 105 | 95 % |
| Medusa by zetamath (on 9. August 2022, 18:01) | 81 | 96 % |
| Te Ka (Nurikabe Chaos Construction) by MaizeGator (on 16. June 2024, 03:39) | 78 | 97 % |
| Mut by ICHTUES (on 31. October 2021, 06:00) | 44 | 92 % |
| Circumnavigation (Nurikabe Compass Fillomino) by Agent (on 29. November 2022, 09:00) | 40 | 95 % |
| Arrow Junkyard by PotatoHead21 (on 17. May 2024, 18:50) | 45 | 95 % |
| Entropy Lockout by Mad-Tyas (on 22. October 2024, 00:01) | 43 | 92 % |
| Cage Play 5: ZipKiller by HalfBakedLunatic (on 4. May 2025, 14:27) | 40 | 94 % |
| Liar Spiral by Niverio (on 29. May 2022, 13:01) | 77 | 98 % |
| Chaos Construction: Arrow Knots by Myxo (on 2. January 2025, 08:51) | 176 | 98 % |
| What Lies Beyond the Fog by ViKingPrime (on 20. December 2023, 21:45) | 150 | 96 % |
| CTC Snake Sum Sudoku by Quarterthru (on 22. September 2020, 04:00) | 39 | 96 % |
| L+ by Joseph nehme (on 25. June 2021, 17:21) | 40 | 96 % |
| Pulling Teeth (Nonconsecutive arrows) by Farkov (on 28. July 2021, 08:48) | 38 | 90 % |
| Seven High by Die Hard (on 1. September 2023, 05:54) | 44 | 93 % |
