Inside (stylized as INSIDE) is a puzzle-platformer adventure video game developed and published by independent studio Playdead. In the game the player controls a young boy in a monochromatic landscape, solving environmental puzzles while avoiding death in a 3D sidescrolling fashion, thematically and visually similar to Playdead's earlier game Limbo.

The game starts with a nameless, red-shirted boy sliding down a rocky incline in a forest. While running through the forest, he encounters forest guards wearing masks, who are either inspecting the forest or are intent on chasing and/or killing the boy. A truck can be seen driving off into the near industrial facility. Escaping a chase from dogs, the boy goes through various environments: a farm where parasitic worms cause pigs to go rampant, a city where lines of people are moved through mind control, a large factory, flooded rooms, a shock-wave atrium and a laboratory environment where scientists are performing underwater experiments on bodies.