Dot!Dot!Go! - Circle Blue Dot

Dot!Dot!Go! - Circle Blue Dot is a simple game with simple rules.
Red dots is block and cant be through. Gray dots can be through and tap on the gray dots, which will turn to red.
Blue dot will go out as far as possible.
When the blue dot is surrounded by red dots,you will win!
Is it very simple?

Features:

* Simple mode,red dots is more and will easy to surround the blue dot.
* Hard mode,red dots is few and will hard to surround the blue dot.
* Double mode,one ues red dots and one ues the blue dot,the rule is same.
* Undo, every mode user can undo all the taps and move.