Spy vs. Spy is a competitive action-strategy game published by Seika for the NES, released in 1988, and it is based on the popular comic strip by Antonio Prohías, which features two spies, a black spy and a white spy, who are constantly trying to outwit and eliminate each other. You play as one of the spies, navigating through a series of rooms in an embassy, collecting items, setting traps, and trying to eliminate your opponent, with a focus on strategy, planning, and stealth. A unique feature is the "versus" system – the game is a two-player competitive game where each player controls a spy, and you must collect items like keys, bombs, and documents, while setting traps like bombs and poisoned food for your opponent, and the first spy to collect all the necessary items and escape wins. The game includes multiple levels with different room layouts, and you can also play against a computer opponent in single-player mode. The graphics are colorful and detailed, with a cartoonish style that captures the comic strip's humor and style. The music is light and playful, with a spy-themed soundtrack. Critics praised the competitive multiplayer and the strategic gameplay. It supports two players. Spy vs. Spy is a fun and strategic competitive game for friends.