(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 | |
|---|---|---|---|
 | Adventskalender 2023, Türchen 13 - Transparentes Yajilin by Zzzyxas (on 13. December 2023, 07:00) | 39 |  94 % |
| Adventskalender 2023, Türchen 15 - Knapp daneben U-Bahn by Zzzyxas (on 15. December 2023, 07:00) | 25 | 93 % |
| I'm going deeper underground... [Snake U-Bahn] by Christounet (on 1. December 2023, 14:13) | 23 | 100 % |
| Bonzo's Montreux by kuraban (on 22. December 2023, 21:35) | 36 | 90 % |
| Bullet Bill (Region-Sum Lines) by LittleNightmaresLady (on 24. January 2024, 18:14) | 20 | 92 % |
| Entropy X-Sums by Mad-Tyas (on 30. January 2024, 10:12) | 62 | 93 % |
| Sorted Subway by KNT (on 22. July 2024, 07:21) | 34 | 100 % |
| U-Bahn with Fillomino enclosures #3 (12x12) by Jesper (on 10. November 2024, 13:37) | 16 | 98 % |
| Knight of Chaos by Andrewsarchus (on 4. December 2024, 18:44) | 33 | 97 % |
| Chaos Sum-dok-U-Bahn by Christounet (on 9. December 2024, 08:07) | 24 | 99 % |
| Short Arrows by Las4one (on 17. December 2024, 11:16) | 38 | 94 % |
| Position Sums mit Average Arrows by glum_hippo (on 27. December 2024, 16:59) | 15 | 98 % |
| Double negative by filuta (on 26. January 2025, 12:28) | 14 | 100 % |
| Bamboozled by NicoD (on 26. February 2025, 05:34) | 14 | 92 % |
| Everything in its Right Place by marty_sears (on 16. October 2023, 01:53) | 87 | 99 % |
| Leakage by Testarossa (on 21. January 2023, 20:10) | 72 | 100 % |
| Secrets and Lines by starwarigami (on 2. November 2021, 19:23) | 72 | 96 % |
| Unique Values by Mesmer (on 25. January 2021, 12:20) | 64 | 99 % |
| Roller Coaster mit Extras 7 by Uhu (on 25. June 2018, 15:32) | 56 | 98 % |
| Entropical Pairadise (Pairrow, Yin Yang) by DubiousMobius (on 23. January 2025, 16:44) | 45 | 97 % |
