Mega Man Zero/Unlockable secrets

Three modes can be unlocked, by clearing the game and meeting certain requirements.

In Hard mode:
 * Zero takes 50% more damage from enemies;
 * Cyber-Elves cannot be used;
 * Weapons cannot be upgraded nor fully charged.

In Jackson mode:
 * Zero starts with the Jackson Cyber-Elf (plus all the cyber-elves he already collected).

In Ultimate mode:
 * All cyber-elves with permanent effect are active without penalty on score;
 * Weapons are at max level;
 * Full-charged attacks can be instantly performed using button combinations.