簡單易學，很難成為高手。
This game has 4 modes "+","-","x","?"
Every mode you should answer the math questions in some time,and the time will be shorter every 5 levels.
"?" is random mode,it means the questions will be "+","-" or "x" mode.
Yeah,so easy to play,but how many levels can you pass.
Join the leaderboard,and invite your friend to play together!!