Scarecrow Nightmare/Challenge Maps

Scarecrow Nightmare (Arkham Asylum)
Batman is placed on a floating graveyard, from which skeletons rise in waves. These skeletons might be armed with unique weapons, such as Swords (Which act the same as pipes), Torches (Which act the same as Stun Batons) and Glowing Dual Knifes (These skeletons act like High Security Henchmen). Taking even one point of damage instantly kills Batman. There are no medals to earn, making it purely a survival challenge. The challenge was originally part of a GameStop pre-order deal, but is now free as part of the GOTY edition.

Scarecrow Nightmares (Arkham Knight)
On the Arkham Knight challenges, the player uses the Batmobile to make their way through a demonic version of Gotham City, and eventually fights the gigantic Scarecrow using the weapons of the Batmobile. The medals of these challenges are based on time; The less time Batman needs to complete the challenge, the better. These challenges are PS4 exclusive.

Medals (1st Challenge)

 * Bronze - Defeat Scarecrow in 6:00 minutes or less.
 * Silver - Defeat Scarecrow in 5:00 minutes or less.
 * Gold - Defeat Scarecrow in 4:00 minutes or less.

Description:

WARNING: HIGH DIFFICULTY CONTENT

Battle Scarecrow and survive the nightmare! Race through the burning streets of Gotham as Scarecrow attacks you with his giant needles, fireballs, and summons a demon army to engulf you in the darkness.

Medals (2nd Challenge)

 * Bronze - Defeat Scarecrow in 6:00 minutes or less.
 * Silver - Defeat Scarecrow in 5:00 minutes or less.
 * Gold - Defeat Scarecrow in 4:00 minutes or less.

Description:

WARNING: HIGH DIFFICULTY CONTENT

The battle continues as you race across Miagani Island! Face off once again as Scarecrow unleashes his nightmare forces and makes it rain cars down from the sky.

Medals (3rd Challenge)

 * Bronze - Defeat Scarecrow in 7:00 minutes or less.
 * Silver - Defeat Scarecrow in 6:00 minutes or less.
 * Gold - Defeat Scarecrow in 5:00 minutes or less.

Description:

WARNING: HIGH DIFFICULTY CONTENT

Bring Scarecrow's nightmare to an end in the final epic showdown! Hunt Scarecrow down on Founders' Island before taking on the master of terror in the heart of Gotham for the last time.

Trivia

 * In Arkham Knight, the nightmares are the only DLC challenges that appear on free-roam. This hints that they were possibly originally meant to be included in the base game, but were cut.
 * The challenges are the only way the Batmobile can be seen on the Island where Lady of Gotham is located.