Tuner Showdown

Released in 2020, Tuner Showdown is a free-to-play idle mobile game for any mobile phone operating system found in many worlds that has an operable smartphone. Using the Note Summon System, players become a Tuner and ally themselves with copies of Arcanum's important figures in history called Notes to fight against a breed of Bug Viruses called Corruptions as well as battle against others in a PVP-style match.
Originally made for a special group of people who made the game from the mysterious scripts of Summoners of Core's past, it was released under the Rune Masquerade's permission as part of the Tuner Initiative.
Joining the game is similar to a normal mobile idle game as they install the game from an app store and play it immediately. However, there are times the game itself recognizes a Tuner Potential and installs itself in their phone where they ask the user to join the game in a yes or no question. If they refuse, they are free to uninstall or play the game normally. If they accept, they are given access to the app's full function including access to their real-life Tuning Armament and the Note Realization feature that lets them bring their Notes into their world.
The gameplay itself revolves around the gacha system to summon a Note and power them up by upgrading its stats through training in real-time. To see more information about Tuner Showdown's gameplay, please visit this gameplay page.

Utility

While it normally acts as a normal mobile game, it also acts as a self-defense tool to those who became real Tuners as they grant them Tuning Armaments to fight alongside their Notes. For Tuners, they can access the Cyber Zone to fight against Corruption along with an ability to travel to other worlds. They can also communicate with other players and Tuners through voice or text chat and access the Note Banners where they can summon new Notes as well as copies of existing ones to enhance them. For all players, they can access the Arcana Hub where they can meet others like them virtually (or in person if they are Tuners).

Inventor(s)

Yoshiro Hiramatsu, Nanami Asano

Access & Availability

The app itself exists as a mobile game in public and it is released under the publisher, "Re:Soul Gaming".