(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 | |
|---|---|---|---|
 | Astronavigation by fjam (on 15. July 2023, 13:12) | 24 |  100 % |
| Wasteland [Landvermessung/Chaos Deconstruction] by zzw (on 16. April 2024, 13:26) | 28 | 94 % |
| Halves and Halve-Nots by ViKingPrime (on 6. December 2024, 21:22) | 26 | 93 % |
| Costco Run: Mixed Nuts, Bananas, Sudoku? (4,14) by Scojo (on 1. February 2025, 11:34) | 26 | 98 % |
| The Trident by GBPack (on 8. March 2022, 20:49) | 46 | 97 % |
| Japanische Inseln, Teil 2 by pirx (on 25. February 2014, 18:30) | 58 | 97 % |
| Triple Japasu III by Luigi (on 27. April 2018, 08:10) | 53 | 94 % |
| Grasshoppers and Horseshoes by antiknight (on 7. March 2022, 23:06) | 21 | 95 % |
| Double Arrows Arrows by Samish (on 24. September 2022, 10:09) | 17 | 92 % |
| Chaos Construction: Oblivion by XeonRisq (on 26. January 2023, 06:00) | 18 | 97 % |
| Arrow Spine Indexing by Die Hard (on 20. March 2023, 11:58) | 19 | 95 % |
| Take Out 2 by Ennead (on 16. July 2023, 21:36) | 17 | 100 % |
| Serpent's Lair (Magic Labyrinth, Snake, Renban, Anti-consecutive) by Chilly (on 13. January 2024, 18:06) | 15 | 96 % |
| Copycat Cipher by Scojo (on 12. August 2024, 19:20) | 16 | 98 % |
| Mambo by zetamath (on 6. September 2024, 00:16) | 42 | 96 % |
| Loopy Circles by Scojo (on 9. September 2025, 22:33) | 75 | 98 % |
| Adventskalender 2025, Türchen 24 - Rundweg by Zzzyxas (on 24. December 2025, 07:00) | 19 | 95 % |
| Rail Pool by KNT (on 1. January 2026, 19:22) | 17 | 97 % |
| Confluence 2: Dumediat Birthday Edition by mathpesto (on 31. August 2023, 17:41) | 66 | 100 % |
| Six-pack Linked Sudokus #8 by Genomico (on 15. September 2021, 04:10) | 45 | 99 % |
