Nightmare Fuel / Batman: Vengeance

• Thugs that you don't handcuff will get back up and attack you again. If you are out of handcuffs and happen to linger around, you'll be constantly looking over your shoulder, waiting for an ambush. It doesn't help that a lot of the secrets in the game are found through exploration of thug-ridden stages.
  • The Funny Bones Warehouse chapter only serves to exaggerate this, by having a ton of pyro Jacks in Boxes roaming the floors. You can't see them easily, but you can most assuredly hear them.
• In "Promethium Fire", one of the stages has you exploring a facility that was attacked by Mr. Freeze. When you arrive, you find that it has been blanketed in ice, with glaciers so massive that they are seemingly growing out of the building The worst part? There are security guards trapped within some of the icy constructs that Mr. Freeze left behind. When you approach them, you can hear the trapped guards crying for help. They're still alive.
• The boss fight with Mr. Freeze at the end of the chapter. Not only does he manage to sneak up on the goddamned BATMAN, he is also too powerful to face in melee combat, forcing you to hang back and use remote charges to drop cryogenic tanks on the villain. All the while, he meticulously walks after you. Not run. Walk, only slightly gaining speed each phase. Like a patient predator.
• "Plant Food". Poison Ivy has never been more terrifying. The plot is that multiple figures in Gotham become hosts to plants that will feed on their insides unless they continue to pay Poison Ivy for food that will keep the plants from becoming parasitic. The mooks you face in this chapter are lifeless plant-like humanoids that are a force to be reckoned with in combat unless you're privy to some electric batarangs that easily dispatch them in one hit. They can't be handcuffed either, leaving you open to ambushes if you linger for too long. You're also exposed to other hostile plant life such as vines that scream in pain when you kill them. However, what really takes the nightmare cake is the boss of this chapter, which is a three-tentacled... thing with an eye and mouth that spits acid and also screams. "Uncanny" doesn't even begin to describe it. The atmosphere of the level pretty much gives you the feeling of being trapped in a nature reserve from hell.
• The Joker himself is probably at his absolute worst here, roughly on par to being as murderous as he was in Batman Beyond: Return of the Joker. He faked his death to keep suspicion off himself, and manipulated the supervillains Mr. Freeze and Poison Ivy into committing their crimes. Joker planned to use the distractions to pump Joker Gas and Promethium flammable gas into Gotham City's sewers, then giddily watch as millions of innocents choke on their own laughter as they burn alive. Even when beaten, Joker attempts to fling himself to his death, hoping to both torment Batman and immortalize himself as the greatest nightmare in Gotham's history.