While purists argue that trainers "ruin" the game, there are three legitimate reasons to use Fling’s tool for Arkham City.

The core of any trainer. In standard Arkham City, a single shotgun blast from a TYGER guard can ruin a flawless combo. With God Mode enabled, Batman becomes the vengeful spirit he was meant to be. You can stand in front of Mr. Freeze’s cannon, tank explosions from Solomon Grundy, or jump off the Wonder Tower without consequence.

A unique feature in Fling’s trainer allows you to freeze enemies solid indefinitely. There is also a "Vehicle Mode" hotkey that freezes the physics of the world, allowing you to walk on air or line up perfect screenshots.