Mamon King, the monster-raising simulation game co-developed with popular YouTube creator Yoshinama, is coming to Nintendo Switch 2 on October 8, 2026. Alongside the digital version, a physical Switch 2 keycard edition will launch simultaneously, responding to fan requests.
Switch 2 Version Launches with Physical Edition and Exclusive Bonuses
Mamon King, already available on Steam, Nintendo Switch, and PlayStation 5, is expanding to Nintendo Switch 2. The Switch 2 version includes a physical keycard edition in addition to the digital download.
The physical edition serves as a collectible item, and early purchasers of the physical version will receive an exclusive bonus: a set of four die-cut stickers with a clear pouch.
Note that the Switch 2 version features an updated save data format that is not compatible with the previous Nintendo Switch version. All players — whether returning or brand new — will begin from the same starting point on Switch 2.
Release Information
Title: Mamon King
Genre: Monster-Raising Simulation Game
Platforms: Nintendo Switch 2 (also available on PlayStation 5, Nintendo Switch, and PC via Steam)
Players: 1
Release Date: October 8, 2026 (Thursday)
Editions: Physical (Switch 2 Keycard) / Digital Download
Pricing:
- Physical Edition (Switch 2): ¥3,960 (tax included)
- Digital Edition (Switch 2 / Nintendo Switch / Steam): ¥1,480 (tax included)
- Digital Edition (PlayStation 5): ¥1,473 (tax included)
Early Purchase Bonus (Physical Edition): Set of four die-cut stickers with clear pouch
Supported Languages: Japanese, English
About Mamon King
Mamon King is a monster-raising simulation game co-developed with Yoshinama, a YouTube creator with over one million subscribers. Players raise monsters called Mamon summoned from another world and aim to become the ultimate Mamon King. The game features a flexible growth system alongside a battle system where player strategy and judgment determine the outcome.
Rankings Achieved After Launch
Since release, Mamon King has topped the Steam domestic sales chart at number one and ranked number two on the Nintendo Switch digital download chart.
Streaming and Let's Plays Are Welcome
Mamon King welcomes gameplay videos and live streams. Individuals and businesses, commercial or non-commercial, can freely post gameplay footage or live streams without prior permission, as long as they do not violate the prohibited activities guidelines.
About Yoshinama
Yoshinama is a video creator with over one million YouTube subscribers who began posting action game commentary videos in 2015. Known for posting nearly every day and living a life centered around gaming, Yoshinama has built a dedicated fanbase drawn to that authentic lifestyle. With near-daily streams on Twitch and other platforms in addition to regular video uploads, Yoshinama continues to captivate a large audience of younger viewers.
