(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 | |
|---|---|---|---|
 | Arrow Battle by 10feet (on 25. November 2022, 06:42) | 15 |  95 % |
| SET PIECE [Multiset Sudoku] by wisty (on 21. November 2023, 17:55) | 40 | 96 % |
| The Method of Differences by DarthParadox (on 16. December 2023, 21:06) | 29 | 95 % |
| A Map to Distant Lands by The Book Wyrm (on 23. August 2024, 18:11) | 27 | 95 % |
| Dorlightfully Devilish by ThePedallingPianist (on 2. November 2024, 20:11) | 15 | 95 % |
| The Neighbour’s Rooftop Window by Wiggel (on 2. January 2026, 22:30) | 15 | 91 % |
| The Fourteenth Floor (Standard Skyscrapers) by Feadoor (on 5. January 2026, 17:59) | 12 | 90 % |
| Melancholia (Build your own arrow) by Sartor (on 15. June 2024, 23:05) | 51 | 99 % |
| Japanische Inseln, Krypto by pirx (on 28. February 2015, 17:00) | 28 | 99 % |
| Junction by grkles (on 22. May 2021, 03:53) | 28 | 99 % |
| Chaotically Coordinated Arrows by Piatato (on 3. March 2022, 19:58) | 65 | 98 % |
| Crypto Japanese Cave (2) by KNT (on 13. October 2022, 23:25) | 64 | 100 % |
| Diagonality by The Book Wyrm (on 15. September 2025, 23:59) | 66 | 93 % |
| Krop Kages by Philipp Huber (on 13. February 2021, 22:44) | 19 | 98 % |
| Magic Arrows by PotatoHead21 (on 3. September 2021, 04:34) | 21 | 97 % |
| El Psy Kongroo by lerroyy (on 21. July 2022, 04:00) | 41 | 97 % |
| Watchtower sudoku by Lizzy01 (on 1. August 2022, 10:24) | 20 | 95 % |
| Double Negative by DadJokes (on 4. October 2022, 13:35) | 19 | 91 % |
| Modern Wall by XeonRisq (on 29. March 2023, 19:00) | 17 | 98 % |
| Wichtel 2022 (6): Das Kleckskakuro by wichtel (on 4. October 2023, 13:13) | 20 | 98 % |
