Descpription:
The player uses an 8-way joystick to pilot a combat aircraft called a Solvalou,
which is armed with a forward-firing "zapper" for aerial targets and a "blaster"
which fires an unlimited supply of air-to-surface bombs for ground targets.
The game was noted for the varied terrain below, which included forests,
airstrips, bases, and mysterious Nazca Line-like drawings on the ground.
There are various aerial enemy aircraft which shoot relatively slow bullets,
as well as (presumably unpiloted) fast-moving projectiles and exploding
black spheres.
Ground enemies are a combination of stationary bases and moving vehicles,
most of which also fire slow bullets. Giant floating motherships appear in
certain areas; these are killed by knocking out their cores.
These are considered one of the first level-bosses to be incorporated
into a video game.
The game has 16 levels but these merge into one another seamlessly.
The Solvalou continually advances over varying terrain and the boundaries
between levels are marked only by dense forests being overflown.
If the player dies, play normally resumes from the start of the level.
If the player has completed at least 70% of the level before dying, play
will begin at the start of the next level instead.
As the Solvalou constantly flies forward, it is theoretically possible to
advance without killing any enemies. More often than not you would die
just before you had "few physical strength" left.
