Proto:Mega Man X: Command Mission

The E3 Version of the game.

Differences
The player can use X, Zero and Axl to fight against Spider and Wild Jango in Central Tower. There are 9 Vaccine Programs and 9 Backups available and Sub Tanks are at 300% energy. The player can not pause and Hyper Mode is not available. After defeating Wild Jango or dying, the demo ends with the message "Mega Cool Timez - Coming Your Way 2004!".

Introduction video
The introduction video appears to be from a earlier version of the demo, as the Action Trigger is different. Some details are not present in the final.
 * The Action Trigger worked in a different way from the final, having a gauge in the top left.
 * In X's Action Trigger, the area becomes dark and the camera moves while he is charging energy.
 * Marino appears in the top of a windmill in Central Tower.
 * Chief R is in a cell from the Tianna POW Camp.
 * The areas Dr. Psyche and Silver Horn appear are dark, and Silver Horn's eyes glow.
 * X's party fight against a Killer Mantis in Central Tower's Heliport. The only battle to happen in this area in the final is the fight against the boss Wild Jango.
 * The Minimap has small white lines around it.

Other differences

 * The battle icons of X, Zero and Axl are different.
 * Spider has a "Boss" text in his boss battle mugshot.
 * The names of playable characters are written in capital letters.
 * X can only talk with a few NPCs and Cinnamon in the demo, having different dialogue.
 * The Minimap is not present.
 * The translation from the scenes with Spider are slightly different.
 * The scenes can be skipped by pressing the Start button instead of holding it for 2 seconds. Only the Start button can skip scenes.
 * Axl can use Silver Horn, Incentas and Mach Jentra in his Action Trigger, and they are named Silver Hound, Ancientus and Blue Wing in the demo.
 * Zero Breakthrough is named Zero Break.
 * Wild Jango's attacks Lightning Rod and Ultra Thunder are named Lightning Thunder and Omega Thunder, and Speed is written as Agility.
 * When a character is with Virus status, a skull balloon doesn't appear above them, being only recognized by the way they move.
 * The Sub Tank options Life Gain and All Life Gain are named Life Energy and Super Life Energy.
 * The Final Strike doesn't show any name in the Sub Weapons, while the final version shows two Ultimate Missiles. Final Strike happens even if the enemy's energy reach 0.
 * Zero's movements contain some graphical errors.

Unused Graphics
The game contains a screen with the temporary title "Rockman X RPG". X is equipped with a Gatling buster (which is different from the Gatling Buster in the final), a shield, and two shoulder cannons, suggesting the game would originally have Sub Weapons visible in the character equipped with them and shield equipments. In the final, Sub Weapons are not seem in the character using them, and the Defend option makes characters go into a defensive position and a barrier appear in front of them.

The demo has chapter titles with temporary names. Except for Chapter 2, all chapters have different names from the final version, like Chapter 4 being "Force Metal Generator" and Chapter 10 "Irregular Hunter". There are also other two unused screens, one saying "DNA Chip 『________』 Get" and other asking if you want to save game data. All screens have an early version of the game's logo.