(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 | |
|---|---|---|---|
 | Harmony by Playmaker6174 (on 3. June 2022, 17:30) | 47 |  97 % |
| Yin Yang Icebarn by Jay Dyer (on 28. September 2022, 00:06) | 48 | 99 % |
| Killer Clones by arbitrary (on 26. January 2024, 16:24) | 23 | 91 % |
| This one goes to 11 by SuperMikal (on 13. November 2024, 20:18) | 49 | 95 % |
| Kropki Dots in Irregular Regions by Md88keys (on 2. January 2026, 05:51) | 32 | 97 % |
| Alfonso and Lori by zetamath (on 26. March 2023, 15:51) | 81 | 95 % |
| Coordi-Loop by Celery (on 5. July 2023, 21:55) | 72 | 97 % |
| Arrow Ratio Sudoku by SudokuExplorer (on 12. January 2022, 00:00) | 43 | 97 % |
| TapaS (the “S” is for SchrödingerS (that “S” is a typo)) by mathpesto (on 5. May 2023, 18:14) | 47 | 96 % |
| Nuribou Sudoku by glum_hippo (on 3. April 2021, 06:00) | 23 | 99 % |
| Roses by PulverizingPancake (on 20. May 2021, 22:55) | 50 | 99 % |
| Battle With The Archers 6: Fallen Archer's Vow by Playmaker6174 (on 5. July 2021, 08:56) | 46 | 97 % |
| Cascade by twototenth (on 20. July 2021, 08:00) | 25 | 94 % |
| Around the World by antiknight (on 23. March 2022, 20:09) | 28 | 91 % |
| Chaos Construction - Border Gaps by Mark Sweep (on 4. January 2023, 10:00) | 26 | 98 % |
| Confusing the Polarity by Allagem (on 20. May 2023, 08:31) | 23 | 96 % |
| The Hare and the Tortoise by ThePedallingPianist (on 12. September 2024, 04:52) | 127 | 96 % |
| A Walk Across Nine Hearts by Rab3aron (on 7. February 2026, 11:07) | 21 | 90 % |
| One Trick Pony by arbitrary (on 2. July 2024, 00:11) | 81 | 92 % |
| Lost and Found: A massive collaboration puzzle by Jeet Sampat (on 27. November 2025, 20:54) | 105 | 96 % |
