Spies are everywhere! Any person may be a spy! You've received a task to detect and liquidate all spies in your region.
But, how to recognise them? You're armed with the most modern weapon - the infra-blue gun! Aiming it on somebody you may see "who is who".
Liquidate the spy!
Aiming - with mouse.
Shooting - spacebar.
detect, Find, kill, liquidate, shoot, spy