(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 | |
|---|---|---|---|
 | Toasted Sandwich (Sums next to 1 and 9 sudoku) by Qodec (on 31. May 2023, 14:00) | 34 |  95 % |
| Leaving the Basement (U-Bahn) by the_cogito (on 16. October 2024, 18:29) | 32 | 100 % |
| [Fog of War Series] 3. Jumpgate Portals by AstralSky (on 28. October 2022, 05:51) | 75 | 92 % |
| Far Far Away (Doubler Remote Sums Sudoku) by Agent (on 11. May 2024, 09:00) | 92 | 99 % |
| Kongruenz-Rundweg mit Renban-Gruppen by ibag (on 21. March 2010, 19:43) | 31 | 90 % |
| Zeichenrundweg (4) by BFaw (on 30. June 2015, 09:00) | 28 | 93 % |
| Teleportation Cycle Sum Sudoku (2) by SudokuExplorer (on 13. April 2021, 01:00) | 27 | 97 % |
| Battle With The Archers 24: Knight's Testimony by Playmaker6174 (on 10. December 2021, 10:29) | 56 | 93 % |
| Effluence by glum_hippo (on 20. August 2022, 17:08) | 31 | 93 % |
| Circumnavigation (Nurikabe Compass Fillomino) by Agent (on 29. November 2022, 09:00) | 30 | 93 % |
| Second Look (Killer/Look-and-say cages) by AnalyticalNinja (on 12. June 2023, 23:12) | 30 | 95 % |
| Halligen II by tuace (on 9. February 2014, 13:00) | 53 | 95 % |
| Rätselquadrat by usp (on 7. July 2014, 00:00) | 56 | 99 % |
| Coordinate Chaos by grkles (on 13. February 2022, 06:38) | 57 | 97 % |
| An Actual Suguru Chaos Construction by mathpesto (on 22. May 2022, 16:32) | 80 | 99 % |
| Thorny issues [German Whisper Deconstruction] by Christounet (on 17. February 2023, 23:36) | 87 | 98 % |
| Timid Dominoes by Genomico (on 15. August 2020, 02:13) | 31 | 99 % |
| "Thermo" ;) by apiyo (on 11. February 2021, 05:51) | 34 | 91 % |
| Parallel Shots (Arrow Killer Sudoku) by Cane_Puzzles (on 15. August 2021, 17:14) | 28 | 93 % |
| The Trident by antiknight (on 12. September 2022, 11:02) | 59 | 95 % |
