Mega Man Zero 3/Unlockables

Link with Mega Man Battle Network 4
Mega Man Zero 3 can be linked with Mega Man Battle Network 4 (either Blue Moon or Red Sun). If you move any one MMBN chip to Mega Man Zero 3, the enemies in cyber-space will change permanently: most of MMZ enemies will be replaced by MMBN enemies.

Mini-Games, Hard Mode and Ultimate Mode
There are 9 unlockables in the game: 2 modes and 7 mini-games. It is possible to unlock them all playing through the game just 7 times.

The Ultimate Mode (easy mode) was already available in Mega Man Zero 1 and 2, but it was just a reward, instead of a new challenge. In Mega Man Zero 3, on the contrary, the introduction of unlockable mini-games is a challenge to be met specifically with the Ultimate Mode.

In order to unlock Hard Mode and Zero's mini-game, you just have to beat Normal Mode. In order to unlock Ultimate (Easy) Mode, you have to collect all secret discs in one game in either Normal or Hard mode. In order to unlock X's mini-game, you just have to beat Hard Mode.