(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 | |
|---|---|---|---|
 | Entropy Production by starwarigami (on 30. November 2022, 09:15) | 26 |  96 % |
| HBD Niverio by twototenth (on 27. December 2022, 08:00) | 76 | 96 % |
| The Friendly Stars by Crusader175 (on 10. January 2023, 15:00) | 30 | 98 % |
| Long Island [Shimaguni Fillomino] by MicroStudy (on 5. May 2023, 01:11) | 58 | 97 % |
| Partition [Little Killer, Yin-Yang Sight Arrows] by 3good5you (on 27. July 2023, 08:56) | 17 | 95 % |
| Snails by Twan2797 (on 23. August 2023, 16:35) | 38 | 94 % |
| XY-Differences Fillomino 2 by glum_hippo (on 30. August 2023, 19:51) | 38 | 92 % |
| Masyudoku [Region Sum Line, Masyu] by 3good5you (on 1. September 2023, 01:31) | 18 | 98 % |
| Companies (Skyscraper, Product Ltd) by Crusader175 (on 5. December 2023, 14:00) | 29 | 94 % |
| German Summing Doppelganger by feethy (on 3. March 2024, 18:40) | 16 | 100 % |
| Think you can break in? (FOW) by antiknight (on 17. August 2024, 02:06) | 229 | 92 % |
| Copycat Confusion by Phistomefel (on 19. August 2024, 18:03) | 116 | 95 % |
| Chaos Construction: FroZen Pentominoes by oklux (on 25. January 2025, 21:14) | 31 | 96 % |
| Read between the lines by Lizzy01 (on 1. April 2025, 01:04) | 19 | 92 % |
| Fisherman's Bend (Appendix Lines) by DubiousMobius (on 17. March 2025, 14:43) | 18 | 93 % |
| Number Snax Doubled by Oddlyeven (on 29. March 2025, 00:51) | 46 | 96 % |
| Killer Line Loop by mellowrobinson (on 12. June 2025, 08:04) | 18 | 95 % |
| Mineswee-Pea-Er (Split Peas/Yin Yang) by damo_89 (on 11. August 2025, 19:52) | 71 | 95 % |
| Eviction Notice (Slingshot/Numbered Rooms) by damo_89 (on 22. August 2025, 10:59) | 49 | 97 % |
| Top Hat Boy by lmdemasi (on 4. September 2025, 13:12) | 34 | 95 % |
