(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 | |
|---|---|---|---|
 | Runder Rundweg 4 by pwahs (on 8. August 2009, 17:26) | 42 |  95 % |
| Chaos Deconstruction: Japanese Sum Cross the Streams Cipher by abed hawila (on 30. March 2023, 17:02) | 43 | 96 % |
| Little Killer Thermo Sudoku by Willy Wonka (on 30. September 2020, 23:40) | 63 | 98 % |
| Addierter Neuner in Doppelpack by Richard (on 5. February 2010, 12:00) | 69 | 93 % |
| Mehrdeutige Rätsel - U-Bahn 3 by Zzzyxas (on 6. September 2017, 00:49) | 38 | 96 % |
| Castle Wall by Mark Sweep (on 22. January 2021, 10:00) | 22 | 92 % |
| Cascade by twototenth (on 20. July 2021, 08:00) | 21 | 93 % |
| Chaos Construction: 2nd Region X-Sums #2 (9x9) by Jesper (on 5. April 2022, 11:15) | 59 | 100 % |
| Double Dip by zetamath (on 21. June 2022, 19:38) | 70 | 97 % |
| Double Equals by josh_johnson (on 13. August 2022, 23:59) | 21 | 96 % |
| What's Literally Eating Gilbert Grape by Thorsby (on 11. December 2022, 08:06) | 44 | 97 % |
| Chaos Construction - Border Gaps by Mark Sweep (on 4. January 2023, 10:00) | 22 | 99 % |
| HalfYin-TwoYang by DJV (on 11. January 2023, 15:37) | 73 | 94 % |
| The Grand Illusion by HalfBakedLunatic (on 14. May 2023, 15:03) | 28 | 94 % |
| Friendly Borders by Prof.Dori (on 15. August 2024, 23:58) | 21 | 90 % |
| Hiding Spots by Xendari (on 27. May 2023, 10:21) | 75 | 96 % |
| Klappstuhl by ICHTUES (on 27. August 2023, 06:00) | 65 | 97 % |
| Battle With The Archers 6: Fallen Archer's Vow by Playmaker6174 (on 5. July 2021, 08:56) | 43 | 97 % |
| Going in Blind by antiknight (on 8. June 2023, 19:10) | 25 | 97 % |
| Coordi-Loop by Celery (on 5. July 2023, 21:55) | 71 | 97 % |
