Speedboat Assassins

Terrorists have seized control of some of the world’s most prestigious
harbours, such as London and New York. As a tough marine commando, you have
been sent in to launch the counter-attacks.

Sensibly, your boss drops you into the action in front of a mine field, and
with no armour. Negotiate the mine field and you come into the main body of
action, in which weaponry can be collected either from that which is left
lying around, or by docking with a supply helicopter when it comes into view.
Enemy ships are all around and must be taken out. Clear these and you reach
the towers, which must be shot down, and finally a ‘boss’ ship to complete the
level.