Dead Space is a science fiction survival horror video game. Players take on the role of Isaac Clarke, controlling him through a third-person perspective. Players navigate the spaceship Ishimura, completing objectives given to Isaac during the narrative, solving physics-based puzzles within the environment, and fighting monsters dubbed Necromorphs.In some parts of the ship that have decompressed, Isaac must navigate the vacuum. While in the vacuum, Isaac has a limited air supply, which can be replenished by finding air tanks within the environment. Some areas are subject to zero-G, with both Isaac and specific enemy types able to jump between surfaces; these areas have dedicated puzzles. During exploration of the Ishimura, Isaac finds ammunition for his weapons, health pickups, and Nodes that are used to both unlock special doors and upgrade weapons and Isaac’s suit. At certain points in the ship, Isaac can access a store to buy supplies and ammunition. Isaac can use a navigation line, projected onto the floor on command, to find the next mission objective.