(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 | |
|---|---|---|---|
 | Meinsweeper by fjam (on 24. June 2024, 20:01) | 24 |  91 % |
| Pseudocount by I Love Sleeping (on 9. November 2024, 15:30) | 21 | 92 % |
| Robot Lines by marty_sears (on 18. November 2024, 12:41) | 144 | 96 % |
| A Song of Ice and Fire by SenatorGronk (on 17. February 2025, 22:29) | 24 | 93 % |
 | Fog and Phantoms: Oar High Water by DubiousMobius (on 10. May 2026, 17:23) | 28 | 97 % |
| Imposter Syndrome by KMD (on 17. March 2026, 23:27) | 21 | 95 % |
| Bowser's Castle (Arrow Sudoku) by emmettcito (on 9. April 2021, 12:58) | 100 | 99 % |
| Read Between the Lines (Build Your Own Puzzle) by tallcat (on 8. December 2021, 03:56) | 97 | 100 % |
| 3... 2... 1... Meteor Strike! by igniteice (on 28. November 2023, 16:04) | 44 | 90 % |
| Clockwork (Sum-Product Frame Sudoku) by Qodec (on 16. December 2025, 21:19) | 44 | 98 % |
| Rätsel Siebenkampf by moss (on 29. September 2016, 22:00) | 46 | 98 % |
| Chaos Construction: Loop Sum by Phistomefel (on 8. April 2022, 18:16) | 143 | 99 % |
| Magic Sandwich Sudoku by Madmahogany (on 10. May 2020, 20:22) | 27 | 99 % |
| 3D Killer Sudoku by SlowLarry (on 21. May 2020, 17:32) | 18 | 96 % |
| Mysterious Samurai (Hard Ver. of Sudoku Challenge 2020) by Kwaka (on 12. September 2020, 23:40) | 17 | 94 % |
| Arrows X by emmettcito (on 7. February 2021, 20:47) | 17 | 92 % |
| Odd X-Sums by Realshaggy (on 25. December 2021, 05:00) | 59 | 96 % |
| The Toppling Tree by fjam (on 9. January 2022, 19:29) | 30 | 99 % |
| Chaos Construction: Internal X-Sums by KNT (on 11. July 2022, 23:23) | 82 | 97 % |
| Recurring Nightmares by Jay Dyer (on 16. October 2022, 01:00) | 43 | 97 % |
