(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 | |
|---|---|---|---|
 | Battle With The Archers 26: Reunion (aka Unity II) by Playmaker6174 (on 7. January 2022, 09:17) | 57 |  97 % |
| Chain Reaction (Killer Sudoku) by AstralSky (on 5. December 2022, 15:53) | 61 | 92 % |
| Aquanuradoku by Mennoo_ (on 6. March 2024, 21:33) | 58 | 90 % |
| TetromUNO by yanggang (on 30. May 2024, 20:09) | 31 | 95 % |
| Let It Go (Nurikabe/Skyscraper/Fortress) by MaizeGator (on 24. June 2024, 00:20) | 31 | 98 % |
| Squiggles by Ratfinkz (on 30. November 2024, 20:38) | 58 | 97 % |
| Dragon Ball / ドラゴンボール / 龍珠 by MonsieurTRISTE (on 10. January 2025, 09:23) | 28 | 92 % |
| Renban Caves by yttrio (on 11. January 2025, 02:59) | 143 | 98 % |
| Whirlygig (Renban Whisper) by tallcat (on 15. April 2022, 16:59) | 103 | 97 % |
| Sudoku Variants Series (318) - Thermometers - Removed Bulbs by Richard (on 28. April 2021, 00:00) | 72 | 95 % |
| Locust by antiknight (on 5. August 2022, 00:03) | 43 | 93 % |
| Sharing Is Caring by ThePedallingPianist (on 5. January 2024, 02:59) | 123 | 96 % |
| Treasure Map by FryTheGuy (on 7. September 2021, 05:36) | 50 | 97 % |
| The Vs by ademjaz (on 12. October 2022, 00:19) | 59 | 93 % |
| Cradle by Xenonetix (on 28. October 2024, 22:55) | 57 | 92 % |
| Numbered Rooms of Entropy by Mad-Tyas (on 6. January 2025, 05:15) | 53 | 93 % |
| The "No-9 Line" by Timpanist (on 7. February 2026, 08:23) | 55 | 97 % |
| Ringban by Ridhwan (on 1. March 2023, 07:21) | 66 | 91 % |
| Anti-King Thermo Sudoku by Blashyrkh (on 26. January 2024, 16:35) | 64 | 95 % |
| Burrows by jovi_al (on 18. July 2021, 03:38) | 75 | 96 % |
