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The episode’s big philosophical question: Do NPCs (non-player characters) matter? Rick argues they are just code. But we see entire civilizations, cultures, and families born and die inside the game. The episode ends with a surprisingly tender moment where Rick refuses to give a "happy" ending—insisting that a life well lived includes pain, loss, and meaning, not just fun.
Rick takes Morty and Summer to invade an arcade game called Roy: A Life Well Lived (first seen in Season 2) to rescue a trapped freedom fighter. The twist? The game contains billions of NPCs living entire lifetimes inside the simulation. To find one person, Rick has to effectively "kill" the universe of the game. rick and morty season 6 ep 2
It sounds like you're referring to the Rick and Morty Season 6, Episode 2 titled The episode ends with a surprisingly tender moment