“technical limitations of the MSX hardware made it impossible to produce a simultaneous display of the player with multiple enemies”
Kojima explained that Metal Gear was born by turning an assignment to make a Rambo-like war game into a game that avoided combat and focused on infiltration, and that the technical limitations of the MSX hardware — which made it impossible to display the player with multiple enemies simultaneously — also contributed.
“thought of a new idea of a 'war game' that avoids combat ... technical limitations of the MSX hardware”