Intro Stage: Eurasia City Under Attack: Sigma Head
Walk to the right on the screen. Kepp going until you get to the room where Alia says that the walls can collapse at any moment. Go to the edge of the floor and wait. The wall will collapse. Go to the next floor and do the same thing. Go to the next floor and move away as fast as you can so you don't get crushed. Dash onto the platform and jump on the wall, then go to the next platform and jump onto the rope as fast as possible. Wall kick on the walls as fast as you can. Go through the door. You will then see X or Zero depending on who you play as. Then Sigma will appear and attack. Keep attacking him but bewhere that once you get Sigma to half-health, he will shoot a powerful purple beam every few attacks. There will be a pause before a noise starts to build up- use this moment to jump onto the wall until he's done with the beam.
Chase the Truck! (Weapons Stockpile): Grizzly Slash
Walk through the cars until you get to the blue thing. Keep slashing it until it breaks and the car starts to explode. Quickly jump to the next car and keep doing this until you come to the car that already explodes. Go as fast as you can and escape the truck! The second truck has a sub-tank as the end of it:try to get it before going to the next car. Then you will be in the warehouse. Keep going until you get to the door. Go in and down the hole. Grizzly Slash will talk and then attack. He is very easy if you can predict where he is going and dodge him. Later you can beat him with the Spike Ball/Twin Dream.
Ocean Floor: Duff McWhalen
Walk through the stage and try not to get stuck. A little while into the stage the U-555 will start to shoot an orange beam at you: avoid this the same way as Sigma's beam, but don't let the U-555 escape. Upon beating the U-555 you will have to do the same thing going down. Then you will enter a sunken ship. Go through. Then you will meet the U-555 again and go upwards. Beat the U-555 again and JUMP ONTO THE WALL BEFORE THE U-555 LEAVES THE SCREEN. If you don't you will lose a life and have to do it again. Enter the door and you will find Duff Mcwhalen. Beat him using the C-Shot/C-Sword.
Dynamo Battle 1: Enigma Laser Area
Beat Dynamo by attacking him with the charge shot/using the C-Sword relentlessly.
Power Plant: Squid Adler
Maneuver through the stage and note that you must keep up with the scroll. Try to collect as many blue things as possible:at the end there is a door that you can only break if you get a certain amount of the blue things. If you don't get enough, go through the hole.(I haven't gotten much farther than the part where you go down the hole yet so I can't give many more hints on this stage, except that Squid Adler's weakness is the goo-shaver/F-splasher.)
Fortress Lab Infiltration (Laser Lab): Izzy Glow
Knock down the pillar blocking you and go to the other floor. Go through the stage: then you will get to a room wher you go on a spiral staircase. When you get to the mini-boss, keep in mind that you want to attack the black thing, not the 2 red/pink ones. Beat Izzy Glow using the Tri-Thunder/E-Blade.
Observatory: Dark Dizzy
Go through the stage and avoid the purple mavericks. When you get to the platform that moves, you will want to get off at pretty much every platform you see. Destroy the bat-like mavericks as soon as you can:they drop spikes onto platforms so you can't step on them, though they do fade away like health capsuls do. When you get to the platform that has needles on the bottom and the moving platform is by it, jump on the side of the platform and when the moving platform moves down alittle fall down without touching the needles, then dash to the platform. Then you will, be transported to another room. Use the gravity-reversing machines, and after a little while you will get to the boss door. Beat Dark Dizzy using the F-Laser/C-Flasher.
Reploid Air Force: The Skiver
It is easier to beat this stage using Zero, especially using the C-Sword. Destroy the time bombs and Mavericks and rescue as many people as you can because doing so gives you some health and an extra life. When you are on the elevator that is outside and you are by the platform with spikes, go to the very edge of the right side of the platform you are on. When you get to the Skiver, beat him using the Dark Hold. Be very careful, because the Skiver can knock you off the platform and then you lose a life.
Dynamo Battle 2: Shuttle Docking Bay
Do the same attack as the first battle. You can also use the Wing Spiral/W-Shredder against him, as this will interrupt his attacks (most notably the ability when Dynamo punches the ground and cause pillars of black energy to comes up).
Beat the mavericks and proceed down the room. Avoid the dragon statues that spit fire:they take away a tom of health. You will then get to a place where lava is below you. Wait until it's gone, then go down. Go to the left and down a hole to find an extra life and a heart tank. Hurry to where you see a rock: then go to any close-by rock that locks dark on the other side. Wait until the lava passes and do the same thing. When you get to the next room, Don't go on the Ride Armor:dash to the platform. After a minute you will encounter the mini-boss. Beat him and the proceed to the next part of the room. When you get to the split with the wires, go to the bottom one:it contains part of the gaea armor. Then go up and you will find Mattrex. Beat him using the Wing-Spiral/W-shredder.
Forest Maze: Axle the Red
Walk through the stage. Most times you can just jump over and ignore the pink rose-like mavericks. When you get to the hole,use the ropes. Bewhere that on the 1st rope where you drop down to get to it, in the middle a vine-like maverick appears. Be wary because they can knock you off the rope!
Zero Virus Maze
Part 1: Crater Entrance and Pale Cyber Maze: Shadow Devil
When you warp into the stage, climb the left wall: there is an extra life. Then proceed down but hurry because there
are lasers. Using Dark Hold will help here. Get past them, and on the second set stay to the right because there is another extra life. Then keep going, and be prepared because when you drop down for the second time you have to do some fast maneuvering. Dodge the lasers and when you can dash to the gap before you land on the floor so you can have a time advantage over the laser. Once you have gotten past the lasers, go on but know that now there are vertical lasers. Once you get past these proceed in the door. Jump and duck over the blobs that fly at you: they take tons of health away if they hit you! Once it is assembled, target the Shadow Devil's "eye" with the Tri-Thunder/E-Blade. However, the eye sometimes appears in different parts of the body, so be alert.
Part 2: Purple Cyber Maze: Rangda Bangda II
This stage requires much maneuvering. The Gaea Armor can help for the boss battle, however, because of the lack of an airdash, going through the stage will be more difficult, especially at the vertical shafts. Be very careful whichever character you choose. After making it through the level, you will find Rangda Bangda 2. Hit the circle that moves around the screen and, once it is at 1/2 health, carefully avoid the spikes.
Part 3: Red Cyber Maze: Argument among Friends (X/Zero Battle)
Carefully avoid the spikes. Once you get to the platform that moves up and down, let yourself get almost squished against the ceiling, then fall to the ground and air dash through the spikes. When you come to a place with a platform above a hole, drop down, sliding down the right wall. After a ways, you will drop through an invisible opening in the wall. Walk on and enter the capsule to gain either Zero's Black Armor or X's Ultimate Armor. Keep going until you get through boss doors. As X, the newly acquired Ultimate Armor really helps here. However, if you play as Zero, fighting X is much easier if you use the c-sword and slash relentlessly.