@Protodude In fact, these are settings for the scene's lighting. This build has the same Debug Menu as X7. In it, we can change some things related to the camera and lighting.

@Nirnoxic Its indeed a part of a unused Sigma Stage.

@Protodude I just checked again. This area is not part of the Underground Base. In fact, it is an area not used in Sigma's stage.

A better video from NCK showing the unused Cyber Field area

@IrregularSaturn Até hoje não tem nenhuma ferramenta que abre os .EMI do mmx7 :(

X should not be here

RED BATTLE we dont have Red and the BG is a pink proto texture

CRIMSON PALACE 1

PALACE ROAD 2 - We can get into the stage, but it is unplayable

PALACE ROAD 1 It is a sidescroller stage The music is from Central Highway

In fact, we can only access the fight against Boarski. Since the stage selection is done via the debug menu, not all slots are accessible at first.

@Protodude

U-BASE 5 (its just the same of the pre-boss area) U-BASE 6 - Boss Battle

UNDERGOUND BASE 4 Its just Crimson Palace with some diferences

UNDERGROUND BASE 3