Batman Arkham Asylum

"The Joker being escorted by Batman in the Batmobile to the asylum after being captured during an armed siege at Gotham City Hall."

"Joker escapes on top of a mobile security cell to Extreme Isolation; he broadcasts a message to Batman from a nearby guard station telling him that Frank Boles, a member of the security team assigned with escorting Joker to his cell, is actually on his side and has captured Gordon. The Joker also warns that if Batman is caught following him, then Gordon will die."

"Batman leaves Intensive Treatment, finding his way to Arkham East, where he discovers that the Batmobile is being attacked by Harley Quinn's henchmen." "Entering the Medical Facility, he encounters Harley and Gordon but cannot reach them due to one of the security fields, thus forcing him to find a different point of entry through the Maintenance Access on the roof."

"Batman catches a glimpse of the Scarecrow and several unfortunate victims of his fear gas trapped in an operating room. Soon he is affected by the gas himself, first subtly then in increasingly surreal ways." "Joker challenges Batman to make it undetected past four of his henchmen patrolling the room; if he is spotted Harley will execute Gordon instantly. If he succeeds, the Joker directs his attention to a surprise left for him in a previously locked chamber in the middle of the room."

"After heading through a locked-up cave outside, Batman glides down to a secret Arkham-based sector of the Batcave, which he installed beneath the island's surface years ago."

"After being forced to contend with more gun-wielding thugs, Batman enters the Arkham Mansion through the air ventilation system."

"Dr. Young is killed and Harley taunts a barely conscious Batman with Warden Sharp, whom she is still holding hostage. After waking up again, Batman tracks Harley to the Penitentiary."

"Now in possession of the knowledge that Joker plans to build an army of Titan-fueled mutants, Batman heads over to the Gardens, but is temporarily stopped by an electrified pond in his path, forcing him to cut the power to the building."

"Batman backtracks through the facility but starts hearing a voice and coughing again; Scarecrow is returning."

"Scarecrow dangles his toxins over the river in the pipeline, threatening to drop them in if Batman comes closer, which would affect the entire city of Gotham. As Scarecrow stands on the edge, Croc jumps out of the water and grabs him."