(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 | |
|---|---|---|---|
 | Falscher Krypto-Rundweg by lupo (on 15. June 2009, 19:24) | 58 |  94 % |
| The Facehugger by sonicbyte (on 12. December 2020, 23:30) | 32 | 97 % |
| Arrow Circus by PotatoHead21 (on 31. May 2023, 23:45) | 31 | 91 % |
| Cave / Stations by KNT (on 12. December 2023, 18:15) | 90 | 99 % |
| Heated Entropy by Mad-Tyas (on 14. December 2021, 00:10) | 64 | 97 % |
| Wichtel 2015 (11): Versunkenes Inselreich entdeckt by wichtel (on 27. June 2016, 21:05) | 31 | 95 % |
| For your big heart with lots of room by tenaliraman (on 12. February 2021, 12:45) | 42 | 98 % |
| Roller Coaster in Rätselhausen by Statistica (on 6. December 2016, 06:06) | 44 | 98 % |
| Rundweg auf dem Würfel by flooser (on 3. September 2009, 12:18) | 74 | 96 % |
| Overflow by TotallyNormalCat (on 7. March 2022, 21:00) | 92 | 98 % |
| Loses Kalenderblatt April 2016 by April (on 1. April 2016, 00:00) | 32 | 98 % |
| Für Rollo zum Geburtstag: Speichenrätsel by CHalb (on 23. June 2017, 23:58) | 31 | 95 % |
| Happy Birthday, marcmees! by ibag (on 15. August 2020, 00:00) | 15 | 100 % |
| Killer Sudoku #1 — ‘The Portal’ by PixelPlucker (on 12. November 2020, 09:48) | 22 | 92 % |
| Club Med (A pure nonconsecutive arrow sudoku) by Farkov (on 9. March 2021, 12:21) | 21 | 95 % |
| Pagoda by TotallyNormalCat (on 8. April 2021, 00:30) | 25 | 100 % |
| Renban Dance by Qodec (on 20. May 2021, 18:27) | 42 | 96 % |
| Angel's Arrow by PotatoHead21 (on 4. July 2021, 03:52) | 22 | 97 % |
| Parity Balance by zegres (on 12. October 2021, 04:51) | 41 | 95 % |
| [50 Puzzles Celebration] Double Trouble Entropy by Mad-Tyas (on 30. January 2022, 03:49) | 32 | 100 % |
