The battle with Psycho Mantis includes a pre-fight "demonstration" of Mantis' psychic abilities, in which Mantis will read the player's memory card. If the player has save data from one of several Konami PlayStation games on their memory card, Mantis will reference that game by name. The games that trigger this dialogue are Suikoden, Castlevania: Symphony of the Night, Vandal Hearts and Azure Dreams.

In the Japanese release, both Policenauts and Snatcher are also recognized. Having save data from both of these games will trigger a message from Hideo Kojima, thanking the player for their continued support, but since both of those games were only released in Japan, this message cannot be heard normally in international versions of the game.