(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 | |
|---|---|---|---|
 | It's a Non-Factor by SSG (on 26. October 2023, 09:24) | 51 |  96 % |
| Think Outside the Box by Jrosas (on 8. April 2024, 07:45) | 54 | 91 % |
| Vaults of the Heavens by Blobz (on 16. June 2025, 16:00) | 57 | 95 % |
| Slalom mit Torstangen, Teil 4 by pirx (on 2. October 2012, 21:44) | 33 | 97 % |
| Position Sums mit Kropki-Paaren by glum_hippo (on 8. February 2021, 15:41) | 31 | 98 % |
| Killomino (Sudoku Fillomino Killer) by purpl (on 21. December 2024, 17:51) | 32 | 96 % |
| Wichtelkalender 2012 (6) by wichtel (on 17. October 2012, 20:12) | 43 | 99 % |
| 9x9 Chaos Constructions: X-Sums and Arrows by abed hawila (on 19. June 2021, 19:51) | 50 | 98 % |
| What Do Killers Eat? by RockyRoer (on 24. September 2022, 14:44) | 63 | 100 % |
| Mama Python 2 (Thermo Snake Sudoku) by peterchayward (on 10. April 2021, 04:31) | 21 | 98 % |
| Rectangle Rodeo (Region Sum Lines) by Mad-Tyas (on 2. March 2022, 22:42) | 24 | 90 % |
| Building The Unknown 2 by Joseph nehme (on 29. April 2022, 16:49) | 15 | 93 % |
| WheelbArrows by Mountainfarmer (on 18. August 2022, 10:47) | 20 | 98 % |
| Collatz's Modifiers by mathpesto (on 12. September 2022, 03:53) | 33 | 96 % |
| Mind the Gaps by jwsinclair (on 20. September 2022, 18:32) | 17 | 98 % |
| Contained Chaos by fritzdis (on 8. December 2022, 22:26) | 38 | 96 % |
| Clone College by SSG (on 17. January 2023, 07:17) | 38 | 95 % |
| Fillomino Pyramid by Myxo (on 26. February 2023, 16:04) | 35 | 97 % |
| Star Killer Part 5: Hull Breach by FischmitFahrrad (on 7. January 2024, 20:00) | 19 | 98 % |
| Whispering Snakeban by yanggang (on 26. April 2024, 19:31) | 16 | 98 % |
