The video shows a first-person view of a game where the player is holding a gun. The player moves through a room with white walls and a black floor. There are several portals on the walls and ceiling, which the player uses to move around the room. The player shoots at a robot that appears in the room and then moves through a portal to another room. The rooms are well-lit and have a futuristic design. The player continues to move through the rooms, using portals to navigate and shoot at enemies. The video ends with the player in a room with a large window and a view of the outside.