INSIDE is a puzzle platformer, in which the player controls a young boy that explores a surreal environment presented as a primarily monochromatic, 2.5D game, using only splashes of color to highlight parts of the environment. The player can make the boy walk, run, swim, climb and use objects in the environment to progress in the game. Later, the boy gains the ability to control lifeless bodies to complete certain puzzles. The boy character can die, including if some puzzles are not completed fast enough, such as being shot with a tranquilizer dart by hunters, caught or eaten by dogs, or drown if kept underwater too long. As with Limbo, these deaths are accompanied by gruesome animations, and the game continues from the most recent checkpoint. Among the environment are hidden rooms that contain lit orbs, which the player can deactivate. If all these are deactivated during a playthrough, the player can unlock the game's alternate ending.
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