Osmosis

Osmosis refers to the act of experiencing dialogue, cutscenes, cinematics, world events and interaction, and NPC behaviour and interaction within a video game without any conscious effort.

When referring to exposure to any of these aspects of a video game for the first time, osmosis specifically refers to the state of being effortlessly (almost passively) engrossed in―getting lost in whilst being enraptured―the intriguing novelty emanating from a new video game you've never experienced.