Number Line is a puzzle game for all ages,you can connect several adjacent numbers with line, if the sum of these numbers is equal to the target,then you pass this level,it may seem simple,but with the increase of the level, there will be more number, bigger target, less time, and it will be more and more difficult.Number line is a very interesting game which is combined with the simple addition,it also help to improve your oral calculation and mental arithmetic, rules are simple, easy to operate, brain puzzle!