(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 | |
|---|---|---|---|
 | Crypto Lying Japanese Cavescraper Ring for polar by KNT (on 20. December 2022, 02:44) | 37 |  99 % |
| Sailing by ThePedallingPianist (on 15. February 2023, 00:18) | 22 | 98 % |
| Missile Command by Xenonetix (on 13. July 2022, 00:44) | 32 | 96 % |
| The S-Cell Miracle by Niverio (on 22. May 2022, 16:40) | 55 | 97 % |
| Sandwich Sudoku by kolot (on 15. July 2021, 18:33) | 35 | 95 % |
| The inconvenient square root (chaos construction) by filuta (on 19. December 2021, 13:30) | 34 | 99 % |
| Mosh Pit by IcyFruit (on 25. April 2024, 14:56) | 17 | 93 % |
| Orchard Out Of Chaos (with 3good5you) by SamuPiano (on 26. October 2024, 15:44) | 17 | 100 % |
| Unique Japanese Sum Sudoku by tesseralis (on 28. July 2023, 05:34) | 76 | 98 % |
| Crux by Jay Dyer (on 22. October 2023, 16:09) | 87 | 97 % |
| Chaos Construction: Increasing Path by KNT (on 3. October 2022, 23:31) | 100 | 97 % |
| Circled Killers by SparkNights (on 12. December 2023, 15:11) | 34 | 96 % |
| Hallig-Rundreise by tuace (on 13. April 2015, 00:47) | 43 | 100 % |
| WPC Preparation 2019: Loopfinder by pwahs (on 3. January 2021, 16:23) | 16 | 100 % |
| There is still life in my sandwich... by Sktx (on 15. May 2021, 00:49) | 15 | 94 % |
| Region Geometry X by kolot (on 2. June 2022, 00:28) | 42 | 99 % |
| Japanese Sums #2: Killer Cages Fillomino by lerroyy (on 3. March 2023, 14:29) | 15 | 98 % |
| Chaos In Frankfurt! (Secret Satan 2023) by Niverio (on 1. January 2024, 17:25) | 35 | 100 % |
| [TSL] [S1T1] Murder Mys2ry [Indexed Little Killers] by 3good5you (on 13. October 2024, 13:00) | 15 | 92 % |
| Palindromic Little Killer X Sudoku by SudokuExplorer (on 23. February 2021, 01:00) | 49 | 96 % |
