(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 | |
|---|---|---|---|
 | Only Green by Sumanta(ANU) (on 2. May 2025, 09:55) | 15 |  93 % |
| The Sumbin by sanabas (on 22. July 2025, 19:43) | 27 | 91 % |
| Divide & Conquer by .proxz14 (on 21. August 2025, 14:22) | 12 | 95 % |
| 24 Rätsel in 24 Stunden (Teil 3) - Höhle by Zzzyxas (on 24. June 2017, 02:24) | 85 | 93 % |
| Starmie (Masyu-Star Battle Hybrid) by MaizeGator (on 18. February 2025, 03:12) | 84 | 96 % |
| 3 Snakes 2 Puzzles by the_cogito (on 19. June 2022, 18:41) | 52 | 93 % |
| Entropic Paradox by XeonRisq (on 1. February 2023, 15:00) | 42 | 94 % |
| Absolute Zero by juggler (on 8. March 2024, 08:24) | 46 | 94 % |
| Battlefield Sudoku #4: Knights! by Big Tiger (on 23. June 2020, 04:08) | 28 | 97 % |
| Prime whispers sudoku (aka "Prime line sudoku") by ibn Muhyiddin (on 4. July 2020, 16:32) | 59 | 96 % |
| Dropsies by RockyRoer (on 12. September 2020, 12:01) | 90 | 97 % |
| Overlapping Notes (Double digit thermometer sudoku) by Aspartagcus (on 28. August 2021, 21:13) | 29 | 98 % |
| Patchwork by steelwool (on 11. October 2022, 18:00) | 29 | 94 % |
| SINIS by ICHTUES (on 16. October 2022, 06:00) | 34 | 96 % |
| Waterworld by Palfly Kampling (on 16. June 2023, 02:37) | 29 | 92 % |
| Loop Compass by Agent (on 9. April 2024, 09:00) | 58 | 100 % |
| One Loop, Two Loop by Belamis (on 21. July 2024, 11:48) | 38 | 96 % |
| Ringban Octopus by ThePedallingPianist (on 22. August 2024, 14:23) | 30 | 94 % |
| AY-KI-YA (chaos construction) by Killer Joe (on 8. November 2025, 03:40) | 32 | 93 % |
| Heavy by zetamath (on 1. January 2026, 22:16) | 121 | 97 % |
