Critical Mass - Version 4.0 Critical Mass is a game set in the future, where youare the commander of a squadron of spaceships. You willbe sent on one of 30 different types of mission,ranging from protecting a convoy, to attacking an enemystarbase, to defending Earth.You fight enemy spaceships using six different types ofmissiles which home in on the nearest target, so youhave to be careful not to destroy your own friends...The game is turn based, but with missiles homing in onyour tail, enemy ships weaving to get out of your lineof sight and sirens screaming warnings at you it canget pretty frantic!