Alan Wake (PC)

Anti-Piracy Features
As of version 1.05, if the game detects that it was installed in a not quite legal form, a few minor aesthetic changes are made to the game in response: Alan Wake wears a pirate eyepatch for the entire game (Barry, on the other hand, wears two!) and the messages shown during loading screens are replaced with a message politely encouraging the player to buy the game if they like it.

Free Camera Mode
Patch version 1.04 added a "-freecamera" debug command-line function that replaces the camera side toggling when clicking in the right stick with toggling a free camera mode. This lets you move the camera around the entire map, which lets you see all sorts of leftovers in the playable maps, and even some crop circles!