(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 | |
|---|---|---|---|
 | 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) | 48 | 95 % |
| Coordi-Loop by Celery (on 5. July 2023, 21:55) | 72 | 97 % |
| The Hare and the Tortoise by ThePedallingPianist (on 12. September 2024, 04:52) | 123 | 96 % |
| Battle With The Archers 6: Fallen Archer's Vow by Playmaker6174 (on 5. July 2021, 08:56) | 45 | 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) | 46 | 96 % |
| Position Sums mit Pfeilen, "Air Opossum" by glum_hippo (on 24. February 2021, 06:00) | 23 | 98 % |
| Nuribou Sudoku by glum_hippo (on 3. April 2021, 06:00) | 23 | 99 % |
| Roses by PulverizingPancake (on 20. May 2021, 22:55) | 50 | 99 % |
| Cascade by twototenth (on 20. July 2021, 08:00) | 25 | 94 % |
| Baba is Two by FryTheGuy (on 25. October 2021, 07:15) | 25 | 100 % |
| Around the World by antiknight (on 23. March 2022, 20:09) | 26 | 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 % |
| One Trick Pony by arbitrary (on 2. July 2024, 00:11) | 81 | 92 % |
| XS-ive Chaos by mathpesto (on 27. February 2022, 03:10) | 51 | 98 % |
| Klappstuhl by ICHTUES (on 27. August 2023, 06:00) | 72 | 97 % |
| Außerirdischer und Osterhase by ibag (on 20. April 2014, 05:10) | 24 | 96 % |
| Maximal Anti-Killer Sudoku by Madmahogany (on 17. July 2020, 23:12) | 33 | 94 % |
