Playdead's Inside Hack -

: By pulling the plug, the boy—and by extension, the player—is disconnected. It suggests that just as the boy was controlled by a mind-control device, the player was the "hacker" or ultimate controller.

: The ending posits that the entire world is an experiment. Pulling the plug is an act of defiance that shuts down the simulation entirely. Development Facts & Trivia Inside - Alternate Ending Playdead's INSIDE Hack

: In the late-game research facility, a massive board with 13 light bulbs indicates your progress. : By pulling the plug, the boy—and by

The secret ending culminates in a long, dark hallway leading to a central computer hub. Pulling a final plug here causes the boy to slump over, lifeless, as the power cuts out. This "hack" is widely interpreted through several lenses: Pulling the plug is an act of defiance

: You must backtrack to a hidden bunker under the cornfield (near the location of the second orb). A previously locked door there now responds to a musical code: Up, Up, Right, Left, Right, Right, Right, Up, Up, Up, Right, Left, Left, Left . The "Hack": What the Ending Means

: Some theorists believe this is the only "good" ending. It allows the boy to escape the cycle of experiments and the "Huddle" (the mass of flesh found in the standard ending) by choosing a definitive end rather than becoming part of a hive mind.