In Code Geass Lelouch of the Rebellion: Lost Stories, players will play as an original protagonist created exclusively for this game and immerse themselves in a Code Geass spin-off story that has never been told before. Players can choose to be either a girl or a boy to experience the story. Other important figures in the Code Geass universe are included in this game for the player to interact with, for instance, C.C., Kallen Stadtfeld, and their mechas – will all play a big role in the game.

When it comes to the game mechanics, Code Geass Lelouch of the Rebellion: Lost Stories adopts an innovative 3D tower-defense battle system. Players need to strategically deploy different units of Knightmare Frame on the map to deal with the swarming enemies. Each Knightmare Frame has its own battle abilities and special skill. Therefore, it relies on the player's tactics and game sense to set up the optimal game plan for each battle.

Outside of the exciting battles, players can enjoy an intriguing adventure mode where an original story is to be told. All the characters that appear in the dialogue are portrayed in delicate Live2D animation. In certain cutscenes, they will even be illustrated in impressive 3D animation to express their charm. Therefore, for every fan of the Code Geass series and of mobile games in general, this game is a must-try.