I have been playing the game for some time, and so far I managed to finish the game in one credit for 3 times, depending on the gun's accuracy.
Here is my latest rank..lol
Only the last chapter I got the S rank (2 life bonuses). Next target, try to get all rank S instead of A (1 life bonus). I am only Top Agent, the best is Special Agent with the rank of 1.
Easy? There is a price to pay..and I am not talking about money. I am not some noob kid who will spend RM40 for a game. Usually I will just spend RM2 ..la la.