[2][3] The game requires the player to protect a massive convoy of space craft as they pass through 32 waves of alien occupied territory.
It combines similar game mechanics to Defender with a setting reminiscent of late-1970s TV show Battlestar Galactica.
The game grants the player freedom to move around the convoy at will, but collision with any part of the fleet results in the loss of a life.
A radar at the top of the screen shows the fleet in its entirety, allowing the player to track alien movement and help navigate.
The game's 32 levels are split into 3 acts (or 'phases') Once a phase has been completed, the player is rewarded with a still postcard style snapshot of a ship in the fleet.