Hello Neighbor Alpha 4 is widely considered the most complete "preview" of the full game, serving as the direct foundation for Act 3 in the final release

Hello Neighbor Alpha 4 was the final alpha build released during the game's development, featuring a massive, multi-story house and expanded stealth mechanics. While "unblocked" versions are often sought on browser-based gaming sites to bypass school or work filters, the official full version of Hello Neighbor Alpha 4 is available on Steam as a free-to-play title. Key Content in Alpha 4

If you manage to get the game running, keep these tips in mind to outsmart Mr. Peterson:

: Throughout the house and basement, you encounter a tall, terrifying shadow entity. This figure represents the trauma and guilt Mr. Peterson is trying to keep locked away. The "Final" Confrontation

Double Jump Ability: This is unlocked in the "school" area by jumping toward a light bulb and pressing space. This is mandatory for crossing the chasm in the basement.

Green Key: Found in a secret room that leads to the "bizarre classroom" with mannequins.  Core Gameplay Mechanics