One of the main features of "The Thing"s gameplay is the inclusion of multiple NPCs who join Blake at various points throughout the game. At any one time, the player can control up to four characters; Blake and three NPCs. There are three types of NPC in the game; engineers, soldiers and medics. Engineers can repair fuse boxes, which control locked doors, computers and save points. Soldiers have more health, and are better shots than engineers or medics. They are thus more suited to combat. Medics are capable of healing both Blake and any other injured NPCs, and carry unlimited health packs. The player can issue basic commands to each NPC, such as ordering them to follow Blake, ordering them to remain where they are, ordering them to give Blake their weapon, and, in the case of engineers, ordering them to fix a fuse box.