Emerald
15 000 XP
Has a chance to trigger once a day on a regular ddk problem.
Uncommon
Recently completed by
Matthew Thiessen 10k, 
Tygo den Otter 9k, 
Phetlada Khamphira 14k, 
Simon Fadda 7k, 
WASAR WASAR (WASAR) 7k, 
Aidan Carlson 8k, 
ming! 10k,
and 396 others.