Exciting New Monster Training Simulation Game 'Mamon King' Launches Today on Nintendo Switch and Steam

Announcing the Launch of 'Mamon King'

Today marks a significant milestone in the gaming world as 'Mamon King,' a new monster training simulation game produced in collaboration with the popular YouTuber Yoshinama, officially launches on Nintendo Switch™ and Steam®. The game is a unique blend of strategy and monster care that promises to keep players engaged.

LiTMUS Inc., headquartered in Minato, Tokyo, and led by President Koichiro Kuwamura, collaborated with Yoshinama, a content creator known for his YouTube channel with over 1 million subscribers, to develop this captivating new title. The game allows players to summon and nurture various monsters known as 'Mamon' in an effort to become the ultimate Mamon trainer, or 'Mamon King.' Players will find the game appealing not only for its innovative training system but also for its combat mechanics, which hinge on strategic decision-making and tactical prowess.

What is 'Mamon King'?

'Mamon King' sets itself apart with its fresh take on monster training games. The gameplay incorporates a diverse array of monsters summoned from another world, giving players the freedom to develop their monsters with personalized strategies. The extensive customization options allow you to craft the most formidable Mamon team.

Yoshinama himself invested 25 million yen to help fund the game’s development, underscoring his commitment to creating a high-quality gaming experience. The battle system is designed to be both straightforward yet sophisticated, providing room for complexity as players refine their strategies.

As part of the launch, there’s an exclusive sale offering a 35% discount on the game's standard price of 1,480 yen. This special pricing will be available for a limited time:

- Steam®: From December 11, 2025, 00:00 JST to December 24, 2025, 23:59 JST, the game will be priced at 962 yen.
- Nintendo Switch™: From December 11, 2025, 00:00 JST to January 7, 2026, 23:59 JST, also available for 962 yen.

For those eager to learn more about 'Mamon King', a launch trailer and gameplay video narrated by Yoshinama himself are now available. These videos detail the game mechanics and illustrate the various monsters you can summon and train.

Game Features

- Monster Summoning and Training: Summon various Mamons and employ different developmental strategies to strengthen them.
- Event Scheduling: Don’t miss out on crucial events and competitions by checking your weekly schedules.
- Simple But Deep Combat System: Engage in battles through a card selection system that, while easy to learn, requires skill and tactical depth to master.

Community Engagement

'Mamon King' actively encourages gameplay sharing. Streamers and content creators are welcome to upload gameplays and live broadcasts without prior permission, provided they adhere to community standards. This open approach aims to promote the game and its features to a wider audience.

Follow 'Mamon King'

For the latest updates about 'Mamon King', players are encouraged to follow the official X account here. Stay informed about major announcements, tips, and community engagements!

About Yoshinama

With a formidable following on YouTube, Yoshinama began sharing gameplay videos in 2015, focusing primarily on action games. His passion for gaming shines through in his consistent uploads and engaging Twitch streams that attract a young audience who appreciate his authentic style.