The English Oxford dictionary defines anarchy as "a state of disorder due to absence or non-recognition of authority or other controlling systems".
Quite what this has to do with the game I don't know. Anarchy puts you in control of a tank and tasks you with destroying all the blocks in the level within a time limit. There are also enemies who blend into the background making them difficult to see. And that's about all there is to it. Thrilling eh?
Nothing about this game is anarchic unless you count the scrolling which is positively headache inducing.