(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 | |
|---|---|---|---|
 | Bodysnatchers by AnalyticalNinja (on 1. October 2024, 20:07) | 93 |  99 % |
| Progressive Divisors by DiMono (on 3. April 2022, 21:10) | 47 | 96 % |
| Cursed Quiver (Arrow Deconstruction) by Xendari (on 6. October 2022, 09:10) | 44 | 99 % |
| Killer Ambiguity by abed hawila (on 8. February 2022, 00:34) | 42 | 98 % |
| The Great Wall by tesseralis (on 9. September 2022, 07:42) | 42 | 98 % |
| Build Your Own Killer: High Pressure by Playmaker6174 (on 14. September 2022, 22:27) | 39 | 100 % |
| Seesaw (Killer Only Sudoku) by Celery (on 10. December 2023, 22:34) | 48 | 97 % |
| Too Close For Comfort by Niverio (on 3. March 2024, 16:11) | 43 | 95 % |
| Galaxy Lunchboxes by Undar_Beyond (on 21. June 2020, 13:57) | 38 | 97 % |
| Deconstruction Chaos Suguru #1,729: It’s All a Lie! by mathpesto (on 2. April 2022, 20:58) | 106 | 99 % |
| Squbler's 100 by mormagli (on 18. October 2022, 02:39) | 37 | 95 % |
| Kropki Magnetplatten III by tuace (on 12. January 2014, 07:30) | 31 | 99 % |
| Secrets and Lines by starwarigami (on 2. November 2021, 19:23) | 67 | 97 % |
| All Directions by Joseph nehme (on 19. February 2022, 07:48) | 29 | 97 % |
| Missing Quads by antiknight (on 28. June 2022, 19:05) | 35 | 93 % |
| Japanese Sums Cave Cipher: Nonogram Cave-ception by Xendari (on 8. January 2023, 13:59) | 28 | 99 % |
| Chaos Arrows by Sotehr (on 27. September 2024, 15:19) | 34 | 90 % |
| Roller Coaster mit Extras 7 by Uhu (on 25. June 2018, 15:32) | 54 | 99 % |
| 4 Corners Killer Sudoku by Strosahl (on 30. September 2020, 17:20) | 29 | 95 % |
| Position Sums mit Renban-Streifen by glum_hippo (on 29. June 2021, 07:23) | 27 | 99 % |
