Simple but addictive! The Stick-out of brain training puzzle playing only with 〇 and ×!

Simple logical puzzle with easy rules, filling 〇 and× in the cells !
There are 1000 quiz in 4 difficulties levels, try gradually the more difficult one, then fully enjoy the depth of LOGIC PUZZLE !

【Rules for 〇× LOGIC PUZZLE】
①Fill the same numbers of 〇 and ×in columns and rows.
②No more than 2 same symbols,
③No same filling patterns with other columns/rows.