Sega Master System / Mark III / Game Gear
Sega's classic coin-op - one of their most successful of all-time - was one of the first Master System games ever released. Hailed by some as "indistinguishable" from the coin-op, it was an instant hit. In actual fact, it bears only the most superficial resemblance to the coin-op, but in the gameplay stakes it scores quite well with just about every feature from the arcade machine present. Although the game isn't as good as say, Fire and Forget II, it's still well worth taking a look at.