The great thing about the games in the Arkham series is they actually let you experience what it would be like to BE the Batman. Of course, you have your primary objectives, but that doesn’t mean that while you’re off busting the major crimes in the city, the low-level scum take a night off. You’ll be notifieid of crimes in progress as you zip around Gotham (such as people getting mugged in an alley). At any time, you can swoop down and save the day, earning precious XP in the process.