No Error Streak II
250 XP
Make no error for 20 problems.
20/20
Common
Recently completed by
Joffrey Lebon 9k, 
Theo van Hintum 8k, 
Krin Krinchai 5k, 
Pier Camillo Iovino 10k, 
qqrooza 8k, 
Алексей Лестаров 10k, 
Michelle McKay 8k
and 9301 others.
