(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 | |
|---|---|---|---|
 | Unique Killers by Yawnus (on 24. February 2023, 11:50) | 54 |  96 % |
| EXit Strategy by riffclown (on 17. May 2023, 13:35) | 100 | 93 % |
| Yin Yang Arrows by yttrio (on 13. October 2023, 23:06) | 129 | 98 % |
| Ménage à Trois by Die Hard (on 5. December 2023, 05:16) | 59 | 95 % |
| Happy Anniversary Mum & Dad! by ThePedallingPianist (on 26. September 2024, 23:34) | 62 | 96 % |
| Extreme Three Color Fun by ebiggie (on 30. May 2025, 00:11) | 85 | 92 % |
| Hitman by NicoD (on 22. August 2025, 05:30) | 71 | 94 % |
| Shenanigans by Jay Dyer (on 9. May 2023, 17:11) | 177 | 98 % |
| Rätselwochenende: Table for Four - Paint it Black Tetrominos by uvo (on 26. November 2014, 16:40) | 40 | 93 % |
| Centripetal Slingshot Sudoku by stephane.bura (on 30. July 2020, 20:00) | 55 | 99 % |
| Diagonal Killer Sudoku by Selsted (on 2. August 2020, 15:10) | 41 | 92 % |
| Little Killer X Sudoku by Willy Wonka (on 10. August 2020, 11:02) | 69 | 97 % |
| Sub-Zero Thermometers by clover (on 20. August 2020, 22:35) | 17 | 98 % |
| Mini Killers by Aspartagcus (on 6. September 2020, 20:30) | 28 | 96 % |
| Odd-Even Sandwich Sudoku by stephane.bura (on 17. September 2020, 20:00) | 17 | 95 % |
| 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 % |
| 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 % |
