GameSpy writes: "Thankfully, you're encouraged to find ways around direct combat during key story encounters, usually due to a hostage who gets popped (read: Game Over) if anyone sees you coming. At one point, Joker-groupie-cum-girlfriend Harley Quinn challenges you to take her (and a roving entourage) down without alerting anyone to your presence; this is one of several sequences that rewards patient gamers, as those who go in with batarangs blazing won't have much success (fortunately, frequent checkpoints minimize grief when it comes to botched stealth ops)".
