Project MIKHAIL has 3 major play modes.

Head out to battle the BETA in your Tactical Surface Fighter.

BETA you defeat will drop parts and items for you to use.

You can equip the parts you found, or make or customize new parts to enhance your TSF.

With your new, stronger TSF, you’ll head back to fight new missions.

This is the basic game cycle. The two game modes of Project MIKHAIL are

Story Mode and Survival Mode.

In story mode, you'll take on the role of Shirogane Takeru, and experience the story of Muv-Luv Alternative.

Each time you clear a mission, new missions will be unlocked, advancing the story.

Sometimes, you’ll have multiple missions to chose from,

and which you choose will change part of the story’s conclusion.

Survival Mode In this game mode, you must survive inside a Potentiality as a nameless Surface Pilot.
You'll switch between advancing Operations, which allow you to select and complete missions issued by any of five factions, and dealing with BETA invasions against Japanese bases, including Yokohama base.
The final power balance between the factions, as well as the state of the BETA invasion at the end of the game, will determine which of 8 different endings you receive.