Each mission has different requirements for completion, and the player will not be able to move on until these goals are met. Some missions also have time limits and other "game over" requirements, which will force the game to end even if the VIXIV is still intact. Items gathered in the previous mission are always carried over to the next (Items gathered in the training mission can be carried over to Mission 1), and the shield will always be restored to full health when the player begins a mission. Though every mission takes place on the same map, the conditions of all buildings, objects, and enemies are reset to default values whenever the player begins a new mission. In general, players will be awarded a star for each completed part of the mission objectives, and a small star for every generic enemy killed.
Mission 1[edit]
The number of stars is reset to 0 when this mission is selected
The game begins with the VIXIV passing through a warp tunnel to arrive in Tetamus 2. The objective is to recover the Power Crystal stolen by the alien army, and deliver it to the Nuclear Silo within 60 minutes. Radar bases will display the location of the Power Crystal or Nuclear Silo, and the finder will point towards these as well.
Mission 2[edit]
At least 1 star is needed to continue
The objective is to destroy the five time bombs set up by the enemy forces within 70 minutes. The radar bases display the location and quantity of the bombs, and the finder will point towards one of the remaining bombs.
Mission 3[edit]
At least 2 stars are needed to continue
The objective is to destroy the two Humanoid Tanks, which were sent in by the enemy forces to destroy the radar bases. Radar bases will display the remaining number of bases and the areas where radar bases have already been destroyed. The finder will point towards one of the remaining Humanoid Tanks. Though this mission has no time limit, the game is lost when all of the radar bases are destroyed.
Mission 4[edit]
At least 3 stars are needed to continue
The objective is to rescue Doctor Yamano, a scientist being held hostage in one of the alien bases, and deliver him to the Nuclear Silo within 60 minutes. The aliens have sent in several decoys, so a photo is provided to identify the real scientist. Radar bases will only display the location of the alien bases, but will order the player to head over to the Nuclear Silo once the real scientist has been rescued. Similarly, the finder will point towards one of the alien bases, and towards the Nuclear Silo once the real scientist has been rescued.
Mission 5[edit]
At least 4 stars are needed to continue
The objective is to destroy the two underground tunnels constructed by the enemy forces. Enemy tunnels can be entered the same way as radar bases, and the player must use the BOMB weapon in the proper location and exit the tunnel within 3 minutes. Both the radar bases and the finder display the location of enemy tunnel entrances. The game is lost if the BOMB weapon is used in the wrong location, or if the player is unable to exit the tunnel within the time limit.
Mission 6[edit]
At least 5 stars are needed to continue
The objective is to guard four trucks carrying reactor rods needed to repair the Nuclear Silo from the giant space insects, and escort them to the Silo within 50 minutes. The trucks will steer in the direction of the Silo on their own, but will not move unless the VIXIV is nearby. The finder will always point towards the trucks, and radar bases will display orders to protect the trucks at all costs. The game is lost if any of the trucks are destroyed, or if the player runs out of time. One star is awarded for each space insect killed, and small stars are rewarded for the number of other kills and reactor rods delivered.
Mission 7[edit]
At least 6 stars are needed to continue
The objective is to recover the reactor rods from the four super gliders and deliver them to the Nuclear Silo within 50 minutes. Radar bases will display hints in locating the super gliders, and will display the message "Head to the North!" after all of the rods have been recovered. The finder points towards one of the super gliders, and towards the Nuclear Silo when all of the rods have been recovered.
Mission 8[edit]
At least 7 stars are needed to continue
The objective is to destroy the five alien cocoons within 15 minutes. Destroying all of the cocoons within the time limit is not impossible, but any cocoons remaining after the time limit will turn into alien butterflies which will begin to attack the radar bases. Radar bases will display the area of the cocoons, and give hints for finding the butterflies once the time limit has passed. The finder will point towards one of the cocoons during the time limit, but butterflies cannot be detected with the finder. The game is lost when all of the radar bases are destroyed by the butterflies. In this mission, a star is awarded for each butterfly killed and radar base remaining at the end of the game.
Mission 9[edit]
At least 8 stars are needed to continue
The objective is to destroy the three cruise missiles within 16 minutes and 55 seconds. The missiles are easy to locate, but are very difficult to destroy. Radar bases give hints for finding the missiles, and the finder points in the direction of the next missile.
Mission 10[edit]
At least 9 stars are needed to continue
The objective of the final mission is to destroy the alien mothership within 30 minutes. Surrounded by an invisible shield, the mothership is impossible to damage with anything other than the HIGH-EX missile. However, the enemy has mobilized all of their forces to destroy the radar bases, and tunnel entrances and junctions will be destroyed when the player attempts to enter them. The player must equip the HIGH-EX from one of the few remaining bases, and collect the necessary amount of missiles and shield health needed to fire the weapon. Radar bases display a warning against using the HIGH-EX without the proper amount of shield health, and the finder will point towards the mothership at all times.