Yu-Gi-Oh (Card Game)
The Tactical Espionage Expert Card is based on Snake from Metal Gear.
Yu-Gi-Oh 7 Trials To Glory
December 30, 2004
In the game Snake makes a cameo apperance in "???". He is disguised as a cardboard box. He says "I don't know why I'm revealing this, but I'm a secret spy. I was hired by an organization, which shall remain nameless, in order to study this Shadow World."
Yu-Gi-Oh and Metal Gear are both made by Konami