VR Missions is the name of the virtual reality training program featured in Metal Gear Solid 2: Sons of Liberty.
The game presents virtual training as a way to teach stealth movement, weapon use, and mission procedures. In the main story, Raiden has completed extensive VR training before arriving at the Big Shell, and the nature of that training becomes important to the game’s themes about simulated experience.
The term also appears in the game’s bonus content. Metal Gear Solid 2: Substance expanded the original release with additional VR and alternative missions, giving players more exercises beyond the main campaign. These challenges isolate individual mechanics and let players practice them in controlled environments.
VR Missions should not be confused with the S3 Plan. VR training is a simulation method, while S3 is the codename for a major plan discussed in the story. Both are associated with simulated behavior but describe different things.