All Cannith challenges are soloable by any character who can kill stuff. Due to scaling, it's noticeably more difficult to solo if you bring a hireling so I would recommend you use a self-sufficient character and no hireling.
The videos linked in thread are of my dedicated challenge farmer, a level 16 pure monk with dragonmark of passage for DDoor. He runs challenges at CR20 for +40% parts bonus. As an added plus, he can just barely open the chests you get for killing bosses, which have an ML of CR-4.
Extraplanar Palace
- Buying Time
- Labor Shortage
- Dragon's Hoard
Lava Caves
- Time Is Money
- Colossal Crystal
- Circles of Power
Kobold Island
- Short Cuts
- The Disruptor
- Kobold Chaos
Dr. Rushmore's Mansion
- Behind the Door
- Picture Portals
- Moving Targets
Note on videos: I run in 1024x768, which youtube recognizes as HD but for some reason it doesn't default to 720p when I play them back. (I think my connection speed is slow.) You may need to manually select 720p when you play them by clicking the little gear icon in the bottom right of youtube's player.
Also, I was concerned about youtube having a 15:00 limit per video so many of the challenges are broken into multiple parts. In those cases I link to playlists instead of the videos directly. Choose "Play All" from the playlists to watch the entire challenge without interruption.