Mega Man ZX

The Mega Man Zero series meets Super Metroid.

Model O
There are unused colored sprites of Model O in the game.





The game itself uses a browned-out variation one of sprites, and the semi-Biometal itself is named "Mysterious Stone".

Though Model O is not obtainable in easy mode, using cheats to obtain it will use these sprites when Vent or Aile are saved from bottomless pits by the Biometal. This implies that Model O may have been intended to be obtained by defeating Omega in easy mode.

Debug Room


The game contains a debug room with several features for test, which include normal surfaces, walls that can't be climbed, a slippery floor, a moving floor, a sinking area, one ladder, water, and spikes. The room can be accessed with the Action Replay code,.

Regional Differences
The Japanese version has all plot-relevant discussion with NPCs voiced, with full voice-acting. All of the other versions remove it completely. Also, all of the Japanese-language battle cries used during gameplay by the titular character (Like "Rock-on!" at every costume change), and most the bosses battle cries before their introduction are removed (with the exception of Promotheus/Pandora, and Omega).