(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 | |
|---|---|---|---|
 | Glass Skyscraper Sudoku(P2) by cdwg2000 (on 25. September 2020, 07:39) | 16 |  91 % |
| Lying Between The Stars by Djmelee3000 (on 3. October 2020, 23:45) | 17 | 95 % |
| Classic Arrow Sudoku by Phistomefel (on 11. October 2020, 09:48) | 144 | 96 % |
| Thermo Sandwich (<>) Sudoku by Cane_Puzzles (on 23. April 2021, 18:00) | 26 | 98 % |
| BarQode Arrows (Renban Arrow) by tallcat (on 2. June 2021, 15:52) | 49 | 98 % |
| Ninja palindromes by Testarossa (on 19. September 2021, 14:22) | 20 | 93 % |
| FABRIK - Buchstabenrätsel / Letter puzzle by DocLogic (on 29. September 2021, 18:05) | 34 | 96 % |
| 真笑Puzzles045--Chaos Construction--ZhangYi004 by cdwg2000 (on 8. March 2022, 15:53) | 25 | 100 % |
| Drawers by stephane.bura (on 5. May 2022, 18:45) | 16 | 98 % |
| Caged Heat by starwarigami (on 11. May 2022, 23:52) | 46 | 95 % |
| ew by mathpesto (on 26. June 2022, 18:28) | 66 | 96 % |
| Time Twister (Killer/Entropic Lines) by Tyrgannus (on 31. August 2022, 23:15) | 47 | 95 % |
| Entropy Dots by Innocuous (on 17. October 2022, 19:49) | 25 | 96 % |
| 3etween 2 (Between lines sudoku) by Qodec (on 5. November 2022, 11:32) | 64 | 96 % |
| Arrows And Renban Lines by Jeet Sampat (on 11. November 2022, 00:32) | 46 | 96 % |
| Build Your Own Killer: The Empty Box by Playmaker6174 (on 18. November 2022, 18:52) | 26 | 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 % |
| All Truths, All Lies by dodomos (on 25. October 2023, 10:00) | 48 | 91 % |
