(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 | |
|---|---|---|---|
 | Islands 4: Chaos Theory by SamuPiano (on 13. March 2024, 20:00) | 15 |  95 % |
| Landvermessung U-Bahn #1 by The Book Wyrm (on 4. April 2024, 21:40) | 32 | 97 % |
| Hunhh? by Joseph nehme (on 7. June 2024, 07:06) | 97 | 95 % |
| Renban shifted x-sums by Lizzy01 (on 20. July 2024, 22:55) | 15 | 93 % |
| Copycat Choco Banana by Scojo (on 6. August 2024, 01:46) | 16 | 98 % |
| Set of Shurikens by SamuPiano (on 20. September 2024, 15:44) | 21 | 96 % |
| Sigma Grindset by Sniglett (on 24. January 2025, 05:52) | 18 | 91 % |
| Enter the Dragon! (Entropic Between Lines) by tallcat (on 14. November 2025, 07:00) | 51 | 93 % |
| YYSL Whispers by Blobz (on 24. April 2023, 16:00) | 101 | 96 % |
| Underling by jwsinclair (on 9. January 2026, 22:57) | 89 | 94 % |
| Castle Wall Fillomino by Agent (on 21. March 2023, 09:00) | 67 | 97 % |
| Killer on the Orient Express by ThePedallingPianist (on 9. December 2022, 19:00) | 52 | 98 % |
| Visible Chaos by Belamis (on 12. March 2025, 19:15) | 83 | 96 % |
| Japanische Bahnhöfe, Teil 1 by pirx (on 27. May 2020, 13:00) | 30 | 94 % |
| Chaos Construction with Slitherlink clues #1 by Phistomefel (on 20. September 2020, 16:25) | 99 | 96 % |
| Parity Party XII, "Herbst" by glum_hippo (on 11. October 2020, 18:05) | 34 | 97 % |
| Kropki'd X-sums sudoku by Nylimb (on 3. November 2020, 02:50) | 32 | 95 % |
| Whispering Arrows by abed hawila (on 9. July 2021, 06:00) | 33 | 95 % |
| Little Killer by PotatoHead21 (on 17. October 2021, 09:59) | 36 | 93 % |
| FARBMISCHUNG - Buchstabenrätsel / Color Mix - letter puzzle by DocLogic (on 28. November 2021, 11:11) | 32 | 97 % |
