Buffalo appearance:
Get to the halfway Boss in the Frost Walruses stage to see the Buffalo from Megaman X3 in the background.

Character appearances:
You might find characters from the original Megaman games on the backgrounds of this game.

Chill Penguin appearance:
Go to Frost Walrus' stage and proceed to the mid-Boss. You will see Chill Penguin frozen in an ice cube. Also, If you look closely in the background, you will see that the wall was broken. This is the exact stage in Mega Man X for Chill Penguin.

Dark Megaman X:
Highlight Megaman at the character selection screen. Then hold [Down] and press F.
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Dark Zero
Highlight Zero at the character selection screen. Then hold [Up] and press F.
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Ultimate X Armor
Highlight X at the title screen, then hold [Up] and press C. After you pass the introduction level, go to the "Web Spider" level. Find the capsule to get the Ultimate X Armor instead of the boots.
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E Tank
To get one of the E Tanks, go to the Cyber level and get the S rank. To do this, jump on the platform that does not have an enemy. Go to Ray's stage area 2. Survive until you see two boxes, a space, and one box. In that space is the other E tank.

Defeating Cyber Peacock:
To defeat him with Zero, use the Z-Saber Enhancement you get from defeating Magma Dragoon.

Defeating Double:
When you reach Double, use the Double Cyclone.

Defeating Magma Dragoon and Slash Beast:
As Zero, use Raijingeki, which does 2 hits on Dragoon and 1 hit on Slash Beast.

Defeating Magma Dragoon:
When you get the armor suit at area 2, get in and continue normally. When you get to the part where you have to jump higher than the suit allows, do not get out. Instead, go in the lava and move forward as quickly as possible, breaking the box things in front of you. You will begin the battle with Magma Dragoon in the suit. Attack him until the suit explodes. By this time, his life should be low.

Defeating Slash Beast:
First, defeat the Stingray and use his weapon in the battle. Shoot him once, then jump over him, turn, and fire again. Repeat this until he goes down.

Defeating the Spider Boss:
When you get to the Spider Boss, dash slide away to dodge his webs, then jump over it.

Defeating Web Spider:
As Zero, use Ryuenjin after if you have Kuuenbu jump and slash him for an extra hit.

Easy helmet upgrade:
Go to the Cyber Peacock stage. Get a rank "S" on the third section. This can be done easily by using the Soul Body (Split Mushroom's weapon) periodically. You can kill the floating eye balls.

Enigma appearance:
Go to web spiders' area. In the background you can see the Enigma from Megaman X5.

Float in mid-air:
Double cyclone is effective in the air since it stops X short and gives him a little more time and distance. Charge up rising fire and jump in the air. When you reach your highest point in your jump, release the charge. You will boost up for a double jump.

Flying boots, body armor, Nova Strike upgrades:
If you are Dark Mega Man, get the upgrade on the Web Spider's stage and you will get the flying boots, body armor and Nova Strike (a very powerful blast).

Frost Walrus stage: Easy heart:
An easy way to get the heart is to shoot upwards with the Magma Dragoon Flame Upwards ability.

Megaman X: Ultimate armor (Japanese version):
Press [Up] and [Shoot] buttons while selecting Zero. Enter a special armor capsule to receive the new armor.

Megaman X: Ultimate X Buster Attack:
When you want to destroy an enemy easily, hold [Attack] for a few seconds. Release [Attack] and he will blast a huge X Buster. The more energy MMX receives, the stronger his X Buster gets.

Robot Ride Armor #1:
The location of the first Robot Ride Armor is in the level with jets/planes. Keep going straight and you will find a blue Robot Ride Armor. You can easily destroy enemies with those.

Spark Mandrill appearance:
Start Frost Walrus's stage and look closely in the background. A big frozen Ice block frozen like Spark Mandrill.

Storylines:
Zero and MMX have different storylines in the game. The one that is most interesting is Zero's.

W Tank:
Go to Snow Base area 2. Destroy all of the ice blocks until you reach a platform that leads you left or right. Go left and destroy the ice blocks. You will eventually find the W tank.

Zero: Black armor (Japanese version):
Press [Down] and [Shoot] buttons while selecting Zero.

Zero: Saber Attack:
Zero cannot recharge his weapon, but using his saber he can destroy enemies easily. Press [Dash] + [Attack] while striking an opponent. This will make Zero's saber attack stronger and faster.

Zero's power attack:
After gaining the Fire attack for Zero, just attack as you normally would except tap his slash attack two times and on the third time use his Fire attack.