(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 | |
|---|---|---|---|
 | Aqraf by CJK (on 24. October 2022, 19:49) | 37 |  94 % |
| Production Lines by Mr Toffee (on 5. June 2024, 17:35) | 21 | 93 % |
| Octoquadri Pack (volume 4) by The Book Wyrm (on 3. January 2025, 16:58) | 19 | 96 % |
| Tox Box [Lopsided Arrows Sudoku] by Gene The Supreme (on 29. July 2025, 08:00) | 16 | 90 % |
| Shmiddty business by NicoD (on 11. October 2025, 05:30) | 38 | 94 % |
| Parity Party II - "Little Killer at Summer Camp" by glum_hippo (on 11. April 2020, 20:54) | 52 | 91 % |
| Ninth Court by Tyrgannus (on 28. October 2021, 13:36) | 52 | 96 % |
| Lockset by Xenonetix (on 25. June 2023, 21:12) | 56 | 91 % |
| Chaos Construc-to-N by mellowrobinson (on 15. October 2025, 20:10) | 204 | 97 % |
| Branches (arrow sudoku) by Aspartagcus (on 12. September 2023, 13:44) | 70 | 93 % |
| Arrows Accord by graggle (on 8. February 2025, 13:00) | 42 | 93 % |
| Meta Occulta (JeremyDover Collab) by Crusader175 (on 9. February 2026, 15:30) | 38 | 99 % |
| Ramification by NicoD (on 18. February 2026, 05:30) | 36 | 93 % |
| Inert Possum by ChinStrap (on 22. March 2026, 20:26) | 32 | 97 % |
| Juni Domino Monat (2) - Hochhausdomino by Richard (on 8. June 2012, 12:00) | 51 | 96 % |
| LM-Training: Five Fences by JonaS2010 (on 31. May 2018, 22:15) | 53 | 98 % |
| Arr Arr (Doubler Arrow) by ICHTUES (on 14. August 2022, 06:00) | 59 | 97 % |
| Entropy Killer by Mad-Tyas (on 8. December 2021, 00:59) | 105 | 97 % |
| Space Battle by Jeet Sampat (on 14. September 2021, 04:38) | 19 | 93 % |
| Whirlpool by Jay Dyer (on 8. October 2021, 21:23) | 26 | 90 % |
