Like most video games, in 'Hello Neighbor,' the gameplay gets more difficult as players advance. However, that fact is true in other games because the puzzles get more complex or the villains get stronger as the levels increase -- in 'Hello Neighbor,' it gets harder because the game's primary villain learns how to beat the player.
The horror game's main antagonist, 'The Neighbor,' is programmed with machine learning AI that doesn't just automatically respond based on pre-programmed commands. The Neighbor observes the player's actions, learning where they succeed and where they make mistakes on any given level, and he reacts to that information. This means that, the more one plays, the smarter and harder Hello Neighbor's main villain becomes.