Mega Man X5/Parts

Parts requirements
After beating one of the eight main bosses at level 4 or higher, you'll be given the options "Weapon + Life" and "Weapon + Energy". Pick one to get either a Life Up or an Energy Up.

However, if the boss was on level 8 or higher, you instead get "Weapon + Life +" and "Weapon + Energy +" options. Then you get an additional Part along with the Life Up or Energy Up. The Part you get depends on which option you pick; this means you can't get all 16 Parts in one playthrough.

The most Parts you can get is 8, and for that you'll have to waste time at the beginning. The bosses' levels rise as the countdown progresses, so you'll have to enter stages and deliberately lose all your lives, not fighting any bosses until the first boss's level reaches 8. That means you'll have to cut it close to stop the collision. Also, once you've earned a Part, you still won't actually get it until two hours (i.e. stages) later.

Parts list
The color of the icons has a specific meaning:
 * Green parts are the basic ones, that improve energy bars;
 * Blue parts improve mobility;
 * Purple parts improve energy and defense;
 * Red parts improve attack.

Calculation of Mavericks levels
In order to get parts, it is necessary that the Mavericks are at least at level 8. This section helps calculating how many hours must elapse to raise the Mavericks levels

The level of a maverick depends on three factors:
 * 1) a hours factor: the less hour are left, the higher the level;
 * 2) a victories factor: the more mavericks have been defeated, the higher the level of the remaining ones;
 * 3) a rank factor: if the player character has a rank higher than "A", the maverick levels is further increased.

If the 16 hours run out, or if the Earth is saved, the maverick levels will still keep increasing with time.

In the table below it is assumed that X, who starts at rank "B", keeps a "B" or "A" rank. If the Enigma cannon fails (after beating four mavericks), X will have to launch the shuttle before it is completed, or he will fail saving the Earth.

Zero's starting rank is "SA", and that means all Mavericks get a +2 bonus on their level (if he keeps that rank). Therefore, Zero has better chances to collect eight parts and still save the Earth.

It is also possible to defeat the first Maverick at -11 hours using Zero, and then collect eight parts alternating freely X and Zero for the rest of the game. In fact, the availability of parts depends only on the Maverick level.