Like those police games your character here is a police officer and maintain peace and order on the whole city. You also need to protect the civilians. Prevent the bad guys to rule the city. This is where you need to bring back the proper order in a subway that has been infiltrated by outlaws. You also need to shoot those bandits heavily armed with weapons. Try to quickly finish them all to maintain your life and reach the next level. You have to reload your gun, kill them all to gain more points and complete every mission that you have.