Playtime Drives UA in Japan for Global RPG Hit “Legend of Mushroom”, Exceeds D7 ROAS Target by 132%

Ad Spend Increases by 46% After Just One Month of Placement

Hamburg, Germany – July 9, 2025 – adjoe GmbH, a leading provider of mobile app advertising solutions, announced the successful user acquisition results for the RPG “Legend of Mushroom” (operated by 4399 in Japan) through adjoe’s Playtime offerwall ad.

Background on Ad Placement with Playtime

“Legend of Mushroom” is a hugely popular mobile game, boasting over 30 million downloads worldwide. It officially launched in Japan in February 2024. This incredibly engaging idle RPG follows a mushroom hero on various quests in a fantasy world. Players can enjoy continuous stage progression even when idle, along with an exhilarating gacha experience.

Within four months of its Japanese release, the game generated over $100 million in cumulative revenue, quickly becoming a domestic sensation. The game has captivated a large fanbase through collaborations with popular anime and merchandise sales.

Challenges and Objectives Before Playtime Ad Placement

To replicate the global success of “Legend of Mushroom” in the Japanese market, it was crucial to acquire high-quality users who would remain engaged long-term, actively participate in in-game purchases, and contribute to a healthy in-game economy.

While launching large-scale user acquisition campaigns, a key challenge was establishing a high-performing channel capable of maintaining a strong return on ad spend (ROAS). However, the highly competitive Japanese gaming market meant that simply focusing on low installation costs would not yield effective results.

As 4399 explored high-performing channels, Playtime was selected for its ability to achieve scale while maintaining a high ROAS, leading to the decision to run ads on the platform.

Impact of Playtime Ad Placement

Following the implementation, the D7 ROAS achieved 132% of its target (based on Android performance). Building on these impressive results, ad spend was increased by 46% just one month after the initial placement. Furthermore, 4399 decided to leverage Playtime for UA for other titles as well.

Playtime fosters deeper engagement and improved retention because users earn rewards not for simply installing the app, but for actively playing the game.

Zhang Jia Con, Optimization Manager at 4399, says:

“Playtime offers distinct cost advantages, along with higher retention rates and higher quality users than the market average, which we are extremely pleased with. It has significantly contributed to expanding our game’s user base and strengthening our ecosystem.”

About Playtime

Playtime is an app monetization solution that continuously rewards users with in-app currency based on their in-game achievements or time spent playing. Powered by first-party data and machine learning, its advanced targeting ensures users are shown only the app game offers they prefer, leading to higher retention and engagement. By providing immediate and ongoing rewards, Playtime also helps maintain long-term retention of existing customers.

Original Press Release: PRTimes