21-30 most frequent mandarin chinese characters.

Popularity (by total correct streak): 161
Popularity (by number of users): 17

Cards

de/di4 (subor. part. adverbial)/-ly, earth/ground/field/place/land  
dao4 to (a place)/until (a time)/up to/to go/to arrive  
yi3 to use/according to/so as to/in order to/by/with/because/Israel (abbrev.)  
shui4/shuo1 persuade (politically), to speak/to say  
shi2 o'clock/time/when/hour/season/period  
yao1/yao4 demand/ask/request/coerce, important/vital/to want/to be going to/must  
jiu4 at once/then/right away/only/(emphasis)/to approach/to move towards/to undertake  
chu1 to go out/to come out/to occur/to produce/to go beyond/to rise/to put forth/to occur/to happen/(a measure word for dramas, plays, or operas)  
hui4/kuai4 can/be possible/be able to/to assemble/to meet/to gather/to see/union/group/association, to balance an account/accounting  
ke3 can/may/able to/certain(ly)/to suit/(particle used for emphasis)  

Quisition is a browser-based flashcard system that repeats old cards and introduces new ones at optimal time intervals. You can create your own card packs or use those developed by others.