A recent survey conducted by Gamespark asked readers which gaming boss battles they thought were the most impressive. Among the choices of the readers were The Boss (MGS3) and Psycho Mantis (MGS1).
In response, Hideo Kojima posted on his Twitter which boss battles from the series were most impressive to him. As a runner-up he chose the Cyborg Ninja from MGS1, and his number one choice is the boss battle against Running Man in Metal Gear 2: Solid Snake for the MSX.
This boss fight takes place in a corridor filled with gas, and has to be defeated by placing mines in the enemy’s path.
Source: Hideo Kojima’s Twitter