(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 | |
|---|---|---|---|
 | Unendliches Rundwegrätsel by immi (on 29. January 2012, 14:51) | 13 |  93 % |
| Schatzsuche - Finale by AI1463 (on 31. July 2014, 14:06) | 40 | 98 % |
| Roller Coaster mit Extras 15 by Uhu (on 24. June 2019, 18:07) | 39 | 99 % |
| Friends in unknown lands (chaos construction) by filuta (on 11. June 2022, 13:10) | 28 | 94 % |
| 8x8=9x9 by filuta (on 13. August 2022, 17:30) | 30 | 99 % |
| Out of the way by PrimeWeasel (on 18. October 2022, 10:13) | 21 | 94 % |
| 9x9 Chaos Construction: Minesweeper by SudokuExplorer (on 11. April 2023, 00:03) | 61 | 92 % |
| U-Bahn with Quadrants for wooferzfg by KNT (on 22. April 2023, 16:45) | 38 | 96 % |
| Bletchley Park by fjam (on 11. June 2023, 20:40) | 21 | 100 % |
| U-Bahn with Empty Clues (4) by KNT (on 28. July 2023, 15:50) | 46 | 97 % |
| Roller Coaster mit Myxo by KNT (on 18. September 2023, 23:43) | 20 | 97 % |
| What by zzw (on 21. September 2023, 04:17) | 67 | 91 % |
| Japanese Sums #3: Combination by lerroyy (on 3. November 2023, 12:57) | 16 | 95 % |
| Slitherlink Akari Pentomino Partial Latin Square With Ciphered Clues by filuta (on 2. December 2023, 17:42) | 12 | 100 % |
| Buttered Cat Paradox by Kafkapharnaum (on 5. January 2024, 19:50) | 20 | 100 % |
| Walls of Eternal Damnation (Secret Satan) by Agent (on 22. January 2024, 09:00) | 30 | 97 % |
| Japanese Japanese Sums Sums #2 by The Book Wyrm (on 12. March 2024, 21:51) | 32 | 98 % |
| Sorted Coral Subway by wooferzfg (on 3. August 2024, 08:23) | 18 | 100 % |
| Wichtels Rätselsommer 2024 (7): Die Sieben Brücken der Welt by wichtel (on 11. September 2024, 20:23) | 19 | 100 % |
| U-Bahn LITSO (Again) by the_cogito (on 19. November 2024, 19:57) | 18 | 100 % |
