A demo for "PRISM: Guard Shield" has been released, giving players a chance to try out the upcoming FPS by Rebellion. The demo features two single-player missions and three multiplayer maps.

"The year is 2016. Frank Shepherd arrives for another shift as a security guard patrolling the New York Harbor docks. Everything seems fine, until he reports for duty and learns of a disturbance further into the complex.

The player's task is to investigate this disturbance and combat any threat encountered along the way.

Survive long enough and a fateful encounter will reveal the existence of a highly-secretive, homeland defense unit known simply as PRISM, plunging Frank Shepherd into the exciting world of counter-terrorism.

Blending a mixture of action and stealth, PRISM will take you on a rollercoaster ride across America - to identify and neutralize terrorist cells which threaten homeland security."

The 583MB demo can be downloaded from 3dgamers, FileFront, FileShack, Gamer's Hell, or Worthplaying.