Beyond simple cheating, the Beta 3 trainer is widely used by the community to find . It allows players to bypass the puzzle-heavy basement unlock sequence, explore "The Thing" in the basement, and test different strategies against the Giant Neighbor boss battle introduced in this specific beta version. STORY SECRETS - Hello Neighbor BETA 3 Cheats

Beta 3 introduced specific developer countermeasures that trainers must bypass: Detection Symptoms

Beta 3’s stamina system was punishing. You could only sprint for three seconds before huffing. A trainer removes this limit, letting you outrun the Neighbor instantly if you toggle invisibility off.