(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 | |
|---|---|---|---|
 | Afterlife (Yin Yang Fillomino Deconstruction) by Agent (on 15. November 2022, 09:00) | 69 |  98 % |
| Fission (Classic Thermo) by emmettcito (on 7. May 2021, 12:37) | 30 | 96 % |
| Entropia (Skyscraper, Entropy) by Mad-Tyas (on 16. January 2023, 12:15) | 50 | 92 % |
| Manhattan by wooferzfg (on 17. August 2023, 02:49) | 27 | 98 % |
| Cryptic Shaders by wooferzfg (on 27. January 2024, 09:27) | 12 | 100 % |
| Does Phistomefel's Ring Still Apply? by bodemeister (on 23. February 2024, 08:43) | 14 | 98 % |
| Sabal (Colossal Fillomino Sudoku) by sfushidahardy (on 22. April 2025, 22:01) | 35 | 100 % |
| Zodiac Project: Leo by ChinStrap (on 16. July 2025, 13:54) | 29 | 95 % |
| Crystalline Entity by IcyFruit (on 22. May 2025, 13:23) | 57 | 91 % |
| Archery Target by Nahileon (on 24. April 2022, 15:48) | 42 | 97 % |
| Chaos Construction: Aquarium (2) by KNT (on 23. June 2022, 01:08) | 63 | 98 % |
| Das Prinzip der Polarität by tuace (on 3. September 2017, 17:16) | 25 | 96 % |
| Miracle Clones [Tribute to Botaku] by Undar_Beyond (on 10. November 2020, 20:34) | 32 | 91 % |
| Multi-sudoku: Orb 2 by DiMono (on 23. April 2021, 07:58) | 29 | 98 % |
| Wichtel 2017 (8): Ein rätselhaftes Experiment by wichtel (on 17. August 2018, 03:05) | 37 | 100 % |
| Friendly X-Sums (Chaos Construction) by thoughtbyte (on 16. July 2022, 23:11) | 40 | 99 % |
| Invisible Killers by yttrio (on 10. March 2023, 21:32) | 41 | 95 % |
| Doppelcrypto Japanese Cave by KNT (on 3. October 2023, 18:10) | 46 | 97 % |
| Poison Arrow by FryTheGuy (on 23. April 2021, 20:14) | 32 | 94 % |
| Arrow Forest by PotatoHead21 (on 28. September 2021, 09:51) | 15 | 91 % |
