(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 | |
|---|---|---|---|
 | 真笑Puzzles046--Chaos Construction--ZhangYi005 by cdwg2000 (on 13. March 2022, 00:50) | 21 |  97 % |
| Chaos Construction: Arukone by Dandelo (on 17. April 2022, 01:27) | 23 | 96 % |
| When-in-drome by Mojo872 (on 20. April 2022, 03:41) | 23 | 94 % |
| Shyscrapers by Lisztes (on 25. July 2022, 23:30) | 30 | 100 % |
| Die Kryptos - S05E02: Teilchenzoo by tuace (on 1. September 2022, 20:22) | 20 | 99 % |
| Effluence by glum_hippo (on 20. August 2022, 17:08) | 36 | 94 % |
| Entropic Tiles by crispy16 (on 3. September 2022, 22:58) | 27 | 94 % |
| Kakuro-Suguru Chaos Construction by mathpesto (on 25. January 2023, 20:05) | 104 | 98 % |
| Joint Efforts by sujoyku (on 13. October 2023, 15:08) | 25 | 90 % |
| Rockets by igniteice (on 8. December 2023, 16:29) | 24 | 90 % |
| Whimsical Whisper Snake by starwarigami (on 27. January 2024, 00:09) | 41 | 100 % |
| A View to a Kill by DadJokes (on 30. April 2024, 22:37) | 25 | 93 % |
| Bittersweet Candies 4 - A (Mostly) Regular 6x6 Sudoku Pack (reworked) by Playmaker6174 (on 22. May 2024, 01:30) | 20 | 98 % |
| Slitherlink Region Sum Hexuro by Nell Gwyn (on 22. July 2024, 07:10) | 24 | 99 % |
| Sidereal nebulae by NicoD (on 18. July 2025, 05:30) | 25 | 91 % |
| Terracotta Kids (Anti-Knight, German Whisper, Renban, Kropki) by juddimal (on 2. August 2025, 06:14) | 89 | 95 % |
| Blockers by Fenners (on 5. March 2026, 14:58) | 35 | 94 % |
| Excluded by Niverio (on 19. March 2025, 18:30) | 132 | 96 % |
| YZ - XV by Scruffamudda (on 16. May 2023, 03:02) | 75 | 95 % |
| Primal Instinct (Killer Sudoku) by Agent (on 25. July 2023, 09:00) | 166 | 97 % |
