(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 | |
|---|---|---|---|
 | Roller Coaster mit Extras 25 by Uhu (on 5. March 2022, 08:36) | 24 |  99 % |
| Sunken Treasure Chaos Construction by Schwupel (on 24. July 2022, 18:58) | 25 | 97 % |
| Snack'O'Mino [Level #2] by Christounet (on 9. March 2023, 12:47) | 53 | 100 % |
| Orbit by Qodec (on 16. September 2020, 21:38) | 70 | 99 % |
| Extreme Lunchbox 2 by Undar_Beyond (on 21. October 2020, 15:56) | 42 | 97 % |
| Arrow Garden by PotatoHead21 (on 22. August 2021, 03:52) | 41 | 98 % |
| Order! Order! by IcyFruit (on 17. November 2023, 13:57) | 42 | 99 % |
| Zum Geburtstag: Das Geschenk by moss (on 5. October 2017, 23:58) | 30 | 99 % |
| Thermal Galaxy Killer by Alexander Rappa (on 11. July 2020, 15:29) | 35 | 96 % |
| Knotted Arrows by antiknight (on 20. April 2022, 22:34) | 33 | 91 % |
| Half-Baked by tesseralis (on 24. August 2022, 10:41) | 44 | 97 % |
| Syzygies of Susurrus by JayForty (on 3. March 2023, 21:55) | 28 | 92 % |
| Saturnalia by mathpesto (on 13. January 2024, 05:19) | 82 | 93 % |
| Summation U-Bahn #5: Sorted Clues by Agent (on 22. October 2024, 09:00) | 28 | 96 % |
| Bonsai (Ambiguous J-Sum Yin-Yang with Doublers) by MaizeGator (on 19. November 2024, 22:45) | 31 | 100 % |
| DTMF (Dual Tone Multi-Frequency) by ebiggie (on 24. March 2025, 02:58) | 17 | 94 % |
| River Crossing by IcyFruit (on 22. February 2024, 14:37) | 84 | 98 % |
| Japanese Sums Narrow Cave Cipher: Mirrors (11x11) by Jesper (on 2. June 2023, 16:04) | 34 | 100 % |
| Roller Coaster mit Extras 26 by Uhu (on 10. January 2025, 07:56) | 33 | 100 % |
| Hurricane by SudokuExplorer (on 16. March 2021, 01:00) | 62 | 98 % |
