(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 | |
|---|---|---|---|
 | Drawers by stephane.bura (on 5. May 2022, 18:45) | 16 |  98 % |
| Caged Heat by starwarigami (on 11. May 2022, 23:52) | 46 | 95 % |
| HyperBan by mormagli (on 20. June 2022, 23:33) | 16 | 96 % |
| Regular Tetragons by Oddlyeven (on 18. July 2022, 02:04) | 21 | 93 % |
| Entropy Dots by Innocuous (on 17. October 2022, 19:49) | 25 | 96 % |
| Build Your Own Killer: The Empty Box by Playmaker6174 (on 18. November 2022, 18:52) | 26 | 98 % |
| SC27 - Arrows 2 by kuraban (on 14. December 2022, 21:16) | 29 | 98 % |
| Fifth Element by XeonRisq (on 18. January 2023, 18:00) | 29 | 94 % |
| Yspot (Anti-V Between; Collab w/ Zetamath) by tallcat (on 23. February 2023, 19:50) | 55 | 92 % |
| Pick Up Sticks by heliopolix (on 14. June 2023, 21:06) | 18 | 91 % |
| 200 Light-years to Zetamath (Black Hole) by heliopolix (on 27. August 2023, 19:02) | 41 | 96 % |
| All Truths, All Lies by dodomos (on 25. October 2023, 10:00) | 48 | 91 % |
| Dynamic Quiver by Niverio (on 22. November 2023, 18:41) | 50 | 98 % |
| Augur's gift (Japanese sums/Mean mini/Kropki) by dumediat (on 24. May 2024, 03:09) | 34 | 97 % |
| Highball by MSDOS (on 5. May 2025, 21:45) | 201 | 96 % |
| Doppel Arrows by Scojo (on 6. December 2025, 08:09) | 32 | 93 % |
| Cages with Equal Sums by Md88keys (on 3. March 2026, 04:18) | 20 | 91 % |
| Lineage by zetamath (on 9. May 2026, 20:50) | 58 | 95 % |
| Kombisudoku: Chaos - Pünktchen by Richard (on 11. January 2009, 20:28) | 132 | 92 % |
| Ghost Cages by juggler (on 19. July 2024, 03:38) | 106 | 94 % |
