The following is a list of how to complete each room easily. You must have X (with either the Ultimate or the Neutral Armor; and the Giga Attack or the Nova Strike) and Zero for this level. The following items are also necessary to do this easily: The D-Glaive (For Zero), The Rasensetsu (the weapon obtained from Dark Mantis, it looks like you are performing a ultra fast spin in mid-air) for Zero, Shadow Runner from Dark Mantis for X, and the Giga Attack or Nova Strike. Note: It is easier to finish this stage if you have the Ultimate Armor.
First room: Ocean: Must defeat more than ninety enemies. Use Zero with D-Glaive equipped. When the enemies start appearing, use the Resensetsu. If done quick enough, you should have defeated ninety enemies.
Second room: Falling in Mid-Air: Must defeat enemy within ten seconds. Use X with Nova Strike/Giga Attack equipped. When you see the enemy he will pause for a moment in mid-air, just short of where you need him to be. Just at that moment, perform the Nova Strike or the Giga Attack.
Third room: Multiple Platforms: Defeat an enemy within ten seconds. Use X with Nova Strike or Giga Attack equipped. Most of the time the enemy will be behind and above you. You must turn around quickly and jump. then perform the Nova Strike or Giga Attack.
Fourth room: Rotating Gears: Must be completed within ten seconds. Have either X or Zero. You will notice two enemies jumping near you from either side. Wait for one of the enemies to get close to you. then press R2 to perform the Buddy Attack. If done correctly you will defeat both at them at the same time.
Fifth room: Big Head Man: Must be completed within ten seconds. Use X with Shadow Runner equipped. Start jumping and shooting repeatedly at the enemy with Shadow Runner. He will get smaller, but become faster as he shrinks. You just need to keep up on him.
Sixth room: Conveyor Belt: Must be completed within ten seconds. Use X with Nova Strike or Giga Attack equipped. Face him and just use the Nova Strike or the Giga Attack.
Seventh Room: Two Guards: Must be completed within ten seconds. Use X with Nova Strike pr Giga Attack equipped. One of these guards will jump just before you attack him. Back up against the wall and turn around quickly, then jump and perform the Nova Strike or the Giga attack. Timing is crucial.
Eighth room: Spinning Dragon: There is no time limit. Either use X equipped with Nova Strike or Giga Attack; or Zero equipped with D-Glaive. When you encounter Spinning Dragon, use the D-Glaive with the Buzz Saw Attack.
Note: Vile may appear at one of the end levels. If he does, you may have to restart and try again. He also may show up in the eighth room. If so, you will not have to worry about a time limit; just be careful you do not fall off the train.