(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 | |
|---|---|---|---|
 | Zippular Region Sums by gdc (on 27. March 2024, 19:00) | 25 |  96 % |
| Whose Line is it Anyway? (Region Sum, Renban, Global Entropy) by Chefofdeath (on 16. June 2024, 18:21) | 29 | 93 % |
| One Loop, Two Loop by Belamis (on 21. July 2024, 11:48) | 33 | 96 % |
| Medley by Playmaker6174 (on 2. September 2024, 08:00) | 55 | 93 % |
| Galactic Skirmish (Spiral Galaxy, Star Battle, Killer Sudoku) by AnalyticalNinja (on 1. February 2023, 02:21) | 89 | 95 % |
| Daedalus by jovi_al (on 18. October 2022, 20:36) | 46 | 91 % |
| Entropic Paradox by XeonRisq (on 1. February 2023, 15:00) | 41 | 94 % |
| Battlefield Sudoku #4: Knights! by Big Tiger (on 23. June 2020, 04:08) | 28 | 97 % |
| Overlapping Notes (Double digit thermometer sudoku) by Aspartagcus (on 28. August 2021, 21:13) | 29 | 98 % |
| Azulejos by ndsurgenor (on 15. March 2022, 14:42) | 31 | 96 % |
| Pentopia by au voleur! (on 14. February 2023, 02:04) | 57 | 91 % |
| Waterworld by Palfly Kampling (on 16. June 2023, 02:37) | 29 | 92 % |
| Doppelganger: Crypto Japanese Cave by KNT (on 1. April 2023, 04:05) | 43 | 100 % |
| Whirlwind by SamuPiano (on 2. January 2024, 22:00) | 61 | 98 % |
| Diagonal-Windoku by ibag (on 29. December 2011, 20:09) | 63 | 95 % |
| Thermal Arrow Killer X by primovera (on 15. January 2021, 01:29) | 21 | 94 % |
| Ramparts by SSG (on 11. October 2021, 12:15) | 15 | 90 % |
| Only Thermos by Mesmer (on 20. October 2021, 18:10) | 47 | 94 % |
| Elevator by the_cogito (on 27. October 2022, 15:27) | 32 | 90 % |
| Guns of Icarus by PulverizingPancake (on 2. August 2024, 17:02) | 70 | 93 % |
