(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 | |
|---|---|---|---|
 | Cruel-sum Samurai (Duality lines, Mean minis, 6x6 Samurai) by AnalyticalNinja (on 21. September 2024, 18:53) | 32 |  93 % |
| Twice a night by Fool on Hill (on 10. May 2023, 08:30) | 42 | 92 % |
| 3 Star Star Battle: Skirmish in the Horsehead Nebula by Thorsby (on 3. September 2020, 00:01) | 48 | 98 % |
| Loop With A Difference by Scruffamudda (on 5. May 2023, 00:09) | 49 | 96 % |
| Frohe Weihnachten! by Richard (on 23. December 2011, 12:00) | 57 | 95 % |
| Tie Those Thermos! by LittleNightmaresLady (on 11. May 2023, 18:38) | 70 | 93 % |
| Trick 17 by Mad-Tyas (on 12. December 2023, 12:12) | 63 | 97 % |
| Arrow Sudoku by KNT (on 17. April 2022, 05:46) | 93 | 96 % |
| Rätselwochenende: Table for Four - Paint it Black Tetrominos by uvo (on 26. November 2014, 16:40) | 40 | 93 % |
| Sub-Zero Thermometers by clover (on 20. August 2020, 22:35) | 17 | 98 % |
| Odd-Even Sandwich Sudoku by stephane.bura (on 17. September 2020, 20:00) | 16 | 95 % |
| Lying Between The Stars by Djmelee3000 (on 3. October 2020, 23:45) | 17 | 95 % |
| Anjou by Konzert (on 21. February 2021, 22:12) | 39 | 94 % |
| Goldfish - Killer Sudoku by Mr.Menace (on 24. March 2021, 10:14) | 27 | 95 % |
| Inception by Joseph nehme (on 8. May 2021, 07:42) | 59 | 96 % |
| Killer Elephant by SlowLarry (on 25. May 2021, 12:26) | 28 | 93 % |
| Ninja palindromes by Testarossa (on 19. September 2021, 14:22) | 20 | 93 % |
| Windmill by FryTheGuy (on 4. October 2021, 21:26) | 28 | 95 % |
| 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 % |
