(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 | |
|---|---|---|---|
 | Gravity Sudoku by Cane_Puzzles (on 15. February 2021, 16:49) | 23 |  99 % |
| Wanderlust by 10feet (on 5. August 2021, 13:00) | 32 | 92 % |
| Medieval by UnnamedSorcerer (on 5. August 2021, 03:17) | 15 | 93 % |
| Fievel Goes West by jsmirob (on 30. April 2022, 10:19) | 13 | 95 % |
| Kropki'd calcudoku #2 by Nylimb (on 30. June 2022, 00:35) | 14 | 98 % |
| Sum Killer Between Us by XeonRisq (on 4. July 2022, 17:00) | 44 | 96 % |
| Whisper Dots by XeonRisq (on 24. September 2022, 20:00) | 12 | 93 % |
| All 14 by Mad-Tyas (on 19. October 2022, 11:39) | 54 | 95 % |
| Variations by Nebuzaradan (on 22. June 2023, 16:05) | 14 | 93 % |
| Icarus by Fool on Hill (on 24. August 2023, 20:47) | 52 | 93 % |
| Jello by zetamath (on 1. October 2023, 15:25) | 89 | 93 % |
| Only Green by Sumanta(ANU) (on 2. May 2025, 09:55) | 16 | 93 % |
| Divide & Conquer by .proxz14 (on 21. August 2025, 14:22) | 12 | 95 % |
| Chaotic counting by palpot (on 16. December 2023, 00:08) | 101 | 97 % |
| Roots in the Fog by Kaktuslav (on 9. August 2025, 08:00) | 226 | 96 % |
| Stickier Notes by jwsinclair (on 22. January 2026, 15:08) | 99 | 97 % |
| 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) | 85 | 96 % |
| Anti-Kropki Cages by marty_sears (on 7. August 2025, 07:31) | 198 | 97 % |
| Dark Stars by Blobz (on 26. August 2024, 16:00) | 99 | 96 % |
