Bosconian

The object of Bosconian is to score as many points as possible by destroying enemy missiles and bases. The player controls a small fighter ship that can move in eight directions, and can fire both forward and backward. Each round consists of a number of green enemy bases that must all be destroyed to advance to the next round (a semi-transparent automap helps identify their location). Each station consists of six cannons arranged in a hexagon, surrounding a central core. The player must either destroy all six cannons or shoot the core to destroy a station, and in later rounds the core is capable of defending itself (opening and closing while launching missiles).

Additionally, the player must avoid or destroy stationary asteroids, mines, and a variety of enemy missiles and ships which attempt to collide with his or her ship. Enemy bases will also occasionally launch formation attacks — destroying the leader causes all remaining enemies to disperse, but destroying all enemies in a formation scores extra bonus points. A spy ship (worth a random bonus value) will also appear occasionally, which must be destroyed or the round will go to "condition red" regardless of how long the player has taken.