Games based on conspiracy theories

Bionic Commando
KGB
The Koshan Conspiracy
NARC
Metal Gear Solid
Xenosaga: Episode I - Der Wille zur Macht
Xenosaga: Episode II - Jenseits von Gut und Böse
Xenosaga: Episode III - Also Sprach Zarathustra
The Ninja Warriors
The Conduit
Area-51
Circle of Blood
Broken Sword: The Smoking Mirror
Beneath a Steel Sky
Psi-Ops: The Mindgate Conspiracy
XIII
Majestic
Condemned: Criminal Origins
Condemned 2: Bloodshot
The Moment of Silence
Culpa Innata
Deus Ex
New World Order
Nightlong: Union City Conspiracy
Vampire: The Masquerade - Bloodlines