Best Game Ever

[Jassassino]

The PS1 was honestly one of gamings greatest eras of innovation. Vagrant Story used visual trickery to give the illusion of higher detailed characters by rendering 3 separately textured models simultaneously (base model, lighting on top and shadows on top of that I believe - may be mistaken slightly!), Soul Reaver using real time vertex deformation to alter geography and utilising corners/loading tunnels to create a seemless open world-lite experience, and MGS having routine based enemies with reactive AI that listened to player made sounds, investigated footsteps, etc.

Honestly I find it hard to pin down any one most important/influential/best game ever, but MGS1 does have a solid case.