(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 | |
|---|---|---|---|
 | A Bright Idea by SenatorGronk (on 5. January 2022, 01:55) | 32 |  93 % |
| Cyclone by antiknight (on 2. September 2022, 04:07) | 32 | 91 % |
| Pointing Digits Sudoku by clover (on 3. February 2024, 20:03) | 84 | 96 % |
| Hellseherische X-Sums (Sudoku) by glum_hippo (on 13. February 2025, 04:58) | 29 | 96 % |
| Chaconopia Playground by Mad-Tyas (on 5. September 2025, 10:55) | 28 | 100 % |
| Unlikely friends (Anti-knight thermo sudoku) by Phistomefel (on 21. July 2025, 19:19) | 219 | 96 % |
| Schatzsuche (2001) - Rundweg knapp daneben by AI1463 (on 6. July 2014, 14:06) | 28 | 97 % |
| Nurikabe Killer Sudoku by udukos (on 26. December 2020, 16:33) | 59 | 98 % |
| Lockout Flower by FryTheGuy (on 27. September 2021, 19:04) | 32 | 98 % |
| Secret Caverns by GarlicBredFries (on 31. October 2022, 23:25) | 30 | 93 % |
| Near and far (Kropki pairs/Remote sums/X-sums) by dumediat (on 26. May 2023, 13:54) | 29 | 98 % |
| The Hare and the Tortoise by ThePedallingPianist (on 12. September 2024, 04:52) | 122 | 96 % |
| Words With Friends by lmdemasi (on 16. March 2025, 23:41) | 29 | 97 % |
| Teleportation Cycle Sum Sudoku by SudokuExplorer (on 6. April 2021, 01:00) | 57 | 100 % |
| Summer Snakes by yttrio (on 25. August 2023, 22:28) | 63 | 97 % |
| Things in common by arbitrary (on 22. April 2024, 11:50) | 67 | 98 % |
| Wichtel 2016 (10): Kakuro-Hitori by wichtel (on 13. September 2017, 02:02) | 57 | 95 % |
| Double-or-nothing by tesseralis (on 13. August 2022, 09:30) | 30 | 95 % |
| Chaos Construction: Arrow In-10x10-sity by XeonRisq (on 21. August 2022, 04:00) | 32 | 99 % |
| Richmond (Killer Diagonal) by tallcat (on 13. December 2022, 18:03) | 95 | 97 % |
