Super Thunder Blade/Stage 4

Stage
Stage 4 is similar to Stage 1, though it takes place at night and the player moves at a slightly faster pace than before. In addition, the roads now have horizontal barriers in them that need to be flown over, under or through a gap between two. The midbosses are two robotic vehicles; it is advised to concentrate on dodging their attacks versus an outright assault. The final overhead area is a military base, and the final boss is a large cannon located in the middle of the base.

Mid-boss
Sigma-01 Sub-Commander (S-01) and Sigma-02 Sub-Commander (S-02) in western manual or SIGMA-01 [Σ-01] and SIGMA-02 [Σ-02] in japanese manual. Exclusive to Super Thunder Blade. 25 feet of mechanical armor for infantry, aka mechs. Sigma-01 will stand and shoot at you from a single spot while Sigma-02 hovers around and shoots as well, the latter usually taking longer to defeat. There are chances that he will hit player despite the circle motion.

Boss
Simply called Guerilla Basement in western manual. Exclusive to Super Thunder Blade. A top-down perspective boss zone that replaces behind-the-view perspective guerilla base boss fight in Thunder Blade. The only top-down perspective boss where it's mandatory to destroy a certain target. Make use of air brakes to slowly move backward and not fly past the target.