

The inventory is at the top health, psionic points, nanites, and cyber modules are at the bottom left and the cyber interface and weapon information are at the bottom right.Īs in its predecessor, System Shock, gameplay in System Shock 2 is an amalgamation of the action role-playing game and survival horror genres. The developers achieved this gameplay design by rendering the experience as a standard first-person shooter and adding a character customization and development system, which are considered as signature role-play elements. The player uses melee and projectile weapons to defeat enemies, while a role-playing system allows the development of useful abilities. Navigation is presented from a first-person view and complemented with a heads-up display that shows character and weapon information, a map, and a drag and drop inventory. The backstory is explained progressively through the player's acquisition of audio logs and encounters with ghostly apparitions. At the beginning of the game, the player chooses a career in a branch of the Unified National Nominate, a fictional military organization. Each branch of service gives the player a set of starting bonuses composed of certain skills, though may thereafter freely develop as the player chooses. The Marine begins with bonuses to weaponry, the Navy officer is skilled in repairing and hacking, and the OSA agent gets a starting set of psionic powers. The player can upgrade their skills by using "cyber-modules" given as rewards for completing objectives such as searching the ship and then spend them at devices called "cyber-upgrade units" to obtain enhanced skills. Operating system (O/S) units allow one-time character upgrades to be made (e.g. OSA Agent is one of the three classes selectable by the soldier.An in-game currency called "nanites" may be spent on items at vending machines, including ammunition supplies and health packs. Officially, OSA is a research branch of the UNN, but rumours claim that it also acts as UNN’s “black ops”.

The OSA is a newer branch of the UNN, grounded in the newly established Psionic Disciplines, and already has acquired a rather dark reputation as a group of “spooks”. The OSA (or rarely O.S.A.) is one of the principal organizations in System Shock 2.
