Before there were such hits as Space Invaders, Defender and Asteroids, Sea Wolf was the king of the mountain. One of the most popular arcade games in its day, Sea Wolf is now available in two formats.

Available for iPhone and iPod Touch, a free limited version that allows players to conquer the first two missions can be found here and the full 8-mission app for $1.99 can be found here .

You can't beat the classics.