This is the only level that zone must be traveled throughto get to the next (as a type of training exercise). Your charactercan travel anywhere if desired by blasting open a force fieldwall. Shoot a force field wall from the side as opposed to straighton. With this angle more of the wall will collide with the shot.It should take very few blasts or one grenade to destroy the wall.Look for a small gap on the top of one of the walls on the cornerof the starting area.. Go through the gap to find a few gun emplacementsand a blue horizontal shield covering a whole slew of power-ups,including an extra life. To get those, go to the Yellow zone andblow up a source object outside one of the corners of that redrectangular area with the three source objects and a oval of "crosses"circling them. There is an exit to the Yellow zone at the endof that long alley, after blowing open one of the force fieldsat the end. An extra life can be found under a force field. Toreach it, find the underground chamber in the power plant in Greenzone.
Many power-ups can be found by exploring the areas betweenthe zones. There is an S-bomb in one of the corners of the Greenzone. Memorize where the source cubes and gas cubes are. Movefast, strike hard, and run away to the next target. To save fuel,do not try to destroy every gun platform. There are three extralives hidden in the Red zone, and two secret rooms full of power-ups.Destroy some walls to find them. Try using the P missile to destroythe boss character, while flying around in fast circles to avoidthe counter-attacks.
This is an easy level. Destroy the clearly labeled key toaccess all the charger, life, and gas cubes in the upper rightcorner of the Blue zone. There are plenty of life/fuel cubes scatteredelsewhere in the level.
Leave the first section by using the exit at the southeastleading to the yellow zone; using the exit at the farthest tipat the north; or by going through one of the shield walls.