The Callisto Protocol, players assume the role of Jacob Lee from a third-person perspective.[1][2] Jacob's health is indicated by an implant on the back of his neck called a "C.O.R.E. Device". Health can be replenished with injectable packs found throughout levels. Jacob can use weapons to combat enemies, as well as a melee system to dodge enemy attacks while looking for openings to strike and kill them. Both combat styles can be mixed up, providing greater variety when facing enemy types. Jacob can collect and review audio logs during gameplay.