Inside is a grayscale 2D platformer with an ambiguous plot and minimalist visuals. Players assume the role of an unnamed, defenceless boy.
VIOLENCE: If the player makes a mistake when traversing obstacles or avoiding enemies, the boy dies. Some of these deaths may be disturbing, the worst ones showing the boy being mauled by a dog or dismembered by a trap underwater. The latter shows some gore as a strip of red is seen coming from the boy, resemble guts. These scenes are brief and do not dwell on detail as the screen shortly fades to black and the player gets another attempt, but they are dark and macabre. There is also one scene in which someone is crushed by a large object, resulting in a large blood stain.