Baltron

Baltron is a shooter game that plays a bit of a cross between Defender and Super Cobra. The ship you controls moves at a different speed depending on how far you travel across the screen. The A button shoots, while the B button's function differs depending on which button you press on the direction pad. Pressing left or right with B will change your direction. Pressing Up and B releases a smart bomb, and pressing down with B starts a Warp. There is stage boss if you travel far enough to the right, and the game continues again at a harder degree of difficulty