The port was handled by Turn Me Up Games, who were tasked with bringing the Unreal Engine 3-powered classic to the Switch. The Switch version of Arkham Asylum is based more on the original 2009 release than the later UE4-based remasters found on other platforms, which was a deliberate choice that would have interesting consequences.
The core focus of this exclusive update is stabilizing the frame rate. Initially, traversing the exterior areas of Arkham Island caused severe frame drops. The update implements a more aggressive dynamic resolution scaling system to combat this.
: Enhancements to character textures and environmental lighting. While settings remain lower than PS4 counterparts, the resolution is dynamic, targeting in handheld mode for a sharper look.
The physical cartridge (Rev 001) shipped with version 1.0.0 on the card. Even if you buy the cartridge today, you must download the "exclusive" update from the eShop.