(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 | |
|---|---|---|---|
 | Hey, Are You Awake? by mathpesto (on 7. August 2022, 22:06) | 34 |  97 % |
| Surgical Excision by HalfBakedLunatic (on 1. July 2023, 05:02) | 41 | 96 % |
| Shady Fillomino by Agent (on 18. June 2024, 09:00) | 40 | 99 % |
| Shadow (Cave Skyscraper Hybrid) by tallcat (on 20. November 2022, 09:00) | 58 | 97 % |
| Monster Math by ThePedallingPianist (on 26. October 2023, 02:40) | 29 | 100 % |
| Checkered Slitherlink by KNT (on 18. June 2024, 03:12) | 31 | 100 % |
| Archers and Knights by SudokuExplorer (on 23. March 2021, 01:00) | 93 | 98 % |
| Doubler XL by thoughtbyte (on 6. September 2023, 00:07) | 59 | 99 % |
| Ziemlich japanische Summen mit Irrwisch by ibag (on 10. June 2017, 10:00) | 27 | 99 % |
| Paulas Geheimschrift-Rundweg-Puzzle by CJK (on 19. April 2021, 10:27) | 25 | 100 % |
| Poltrona by ICHTUES (on 8. May 2022, 05:58) | 29 | 100 % |
| Galactic Union (Killer / Spiral Galaxy / Chaos Construction) by Tacosian (on 23. December 2023, 23:26) | 88 | 99 % |
| Matty Didn't Call You Back Because He Had The Wrogn Number by Laake (on 26. September 2024, 22:11) | 80 | 96 % |
| 6556 by abed hawila (on 23. March 2021, 21:07) | 21 | 99 % |
| Surround Set by PrimeWeasel (on 11. February 2022, 12:12) | 21 | 97 % |
| The Unlikely Duos - A 6-pack Linked Sudokus Puzzle by Playmaker6174 (on 8. June 2022, 01:50) | 24 | 99 % |
| The final test (Deconstruction/Killer/Anti-Knight/Connect the dots) by dumediat (on 30. December 2022, 03:17) | 22 | 100 % |
| Fifteen by Die Hard (on 20. March 2024, 00:27) | 23 | 98 % |
| Vampires Magnet Butterfly by damasosos92 (on 15. April 2024, 16:40) | 27 | 93 % |
| Noodles by Paletron (on 10. May 2024, 22:08) | 50 | 97 % |
