(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 % |
| Anjou by Konzert (on 21. February 2021, 22:12) | 41 | 94 % |
| Goldfish - Killer Sudoku by Mr.Menace (on 24. March 2021, 10:14) | 27 | 95 % |
| Killer Elephant by SlowLarry (on 25. May 2021, 12:26) | 29 | 93 % |
| Ninja palindromes by Testarossa (on 19. September 2021, 14:22) | 20 | 93 % |
| Windmill by FryTheGuy (on 4. October 2021, 21:26) | 28 | 95 % |
| FABRIK - Buchstabenrätsel / Letter puzzle by DocLogic (on 29. September 2021, 18:05) | 33 | 96 % |
| Barnyard Mouse - purpl Collab by the_cogito (on 17. December 2021, 16:11) | 18 | 95 % |
| Unum Singulis by Eclectic_Hoosier (on 6. April 2022, 00:46) | 18 | 91 % |
| Drawers by stephane.bura (on 5. May 2022, 18:45) | 16 | 98 % |
| Caged Heat by starwarigami (on 11. May 2022, 23:52) | 46 | 95 % |
| Obstructed View by jwsinclair (on 5. September 2022, 19:17) | 28 | 93 % |
| Galaga by tenaliraman (on 16. September 2022, 10:35) | 55 | 95 % |
| Archer's Tale: The Roundtable by Playmaker6174 (on 7. October 2022, 11:26) | 35 | 97 % |
| Entropy Dots by Innocuous (on 17. October 2022, 19:49) | 25 | 96 % |
| Sea Skeleton [Classic Sudoku] by wisty (on 25. October 2022, 20:28) | 57 | 95 % |
| Fifth Element by XeonRisq (on 18. January 2023, 18:00) | 29 | 94 % |
| Echo Chamber by ndsurgenor (on 26. February 2023, 11:00) | 18 | 93 % |
| EXit Strategy by riffclown (on 17. May 2023, 13:35) | 98 | 93 % |
