Sigma Stage (Mega Man Xtreme)

The Sigma Stage (シグマステージ) is a set of stages from Mega Man Xtreme. It is composed of both the inner workings of the hijacked Mother Computer, and the physical hideout used by Sigma, the Shadow Hunters, and Techno to hack the Mother Computer from the Hunter Base. After the defeat of the reproduction of past enemies, the base is located and X invades it to stop the Mavericks.

Sigma Stage 1
Sigma Stage 1 is supposedly on the way to the core of the Mother Computer, accessible once the Mavericks guarding it have been defeated. It is heavily based on Sigma's Hideout 1 from Mega Man X, but missing the encounter with Vile and replacing the rematch with Boomer Kuwanger with a Shadow Hunter encounter instead.

Enemies:
 * Jamminger
 * Gun Volt
 * Boss: Zain (Normal Mode)
 * Boss: Geemel (Hard Mode)
 * Boss: Bospider

Sigma Stage 2
Sigma Stage 2 is very near the core of the Mother Computer. It is heavily based on X-Hunter Stage 3 from Mega Man X2, but features a data reconstruction of Serges as the boss instead.

Enemies:
 * Cannon Driver
 * Disk Boy 08
 * Barrier Attacker
 * Pararoid R-5
 * Pararoid V-1
 * Batton Bone G
 * Tubamail-S
 * Tubamail Generator
 * Boss: Serges Tank

Sigma Stage 3
Sigma Stage 3 is at the core of the Mother Computer. It is similar to X-Hunter Stage 4 from Mega Man X2, but the tower segment at the start has spikes on the walls and floating platforms. Once the boss rematches have all been completed, X continues down a hallway to face Sigma. After his first form's defeat, X returns to Hunter Base and speaks with Zero about having pinpointed the location of the hacking terminal. X heads there, destroying the terminal and inadvertently killing both Techno and Middy, before facing Sigma's second form and destroying him.

Enemies:
 * Barite Lastar
 * Batton Bone G
 * Flamer
 * Boss: Rematches with the Mavericks
 * Boss: Sigma
 * Boss: Wolf Sigma

Trivia

 * Sigma Stage 3's music is adopted from the fight with Wolf Sigma in Mega Man X. Because of this, Wolf Sigma in this game uses the music from the fight with the Sigma Virus in Mega Man X2 instead.