Hydra © 1990 Atari Games Corp.

An abstract racing game in which the player takes on the role of a special government courier, who must deliver a number of secret cargoes to their various destinations at the end of each stage. Gameplay consists of piloting a heavily-armed hovercraft over a series of waterways, avoiding or destroying the enemy craft and barriers that litter each level. Progress is hampered by mines, enemy hovercraft, logs and other obstacles. Money bags can be collected as well as extra fuel.

On-board fuel depletes at a steady pace and players must keep a look out for additional fuel cells. In addition to a forward-firing gun, the hovercraft is equipped with a 'Boost' function. Providing the player has enough boost fuel, the craft can be made to fly in the air for a limited time; useful for avoiding enemies and barriers, as well as for gaining access to certain bonus items.