N-Sub

## Description

_N-Sub_ puts the player in control of a submarine in the Cobalt Blue Sea. The
action takes place on one screen; the player-controlled submarine can move in
all directions and must defend itself against an onslaught of enemy ships and
submarines by firing torpedoes at them. Torpedoes can be fired vertically
(which is the only way to hit ships) and horizontally (to deal with enemy
submarines), activated by two different buttons. Pressing the button down
allows firing short bursts of three torpedoes each. A round is over after an
enemy fleet of twelve ships and a destroyer has completed a fixed amount of
loops. Subsequent rounds increase the difficulty by making enemy ships more
aggressive.

N-Sub