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4399 Grows Legend of Mushroom by 32.73% with Playtime
PUBLISHER
4399
APP
Legend of Mushroom
HEADQUARTERS
Greater China
REGION
APAC
Highlights
32.73%
increase in D7 ROAS
46%
one-month campaign scale
Japan
successful market expansion
Background
4399, one of the Chinese largest game publishers, focuses on driving success in the Japanese market for their hit title Legend of Mushroom. The team's goal was to expand the user base in Japan and strengthen the in-game ecosystem, all while maintaining strong return on ad spend (ROAS).
Challenge
Japan is a competitive UA market. Low-cost installs won't make a difference: 4399 needs high-quality users who stay, spend, and support a healthy in-game economy. They are looking for a performance channel that could maintain a healthy ROAS at scale.
Solution
4399 partnered with RiverAds and activated the Playtime ad unit: a rewarded model that drives real in-game engagement. Instead of paying for installs, RiverAds paid for time. Users earned rewards by playing, not just downloading, encouraging deeper engagement and stronger retention. To take full advantage of seasonal spikes, the team scaled budgets during Japan's Golden Week; capturing peak traffic and maximizing return.
Impact
The results validated the model: Playtime users engaged longer, converted better, and outperformed ROAS goals. Within just one month, 4399 scaled up their spend by 46%, growing D7 ROAS on Android by 32%, marking a significant improvement in profitability over time.
Looking Forward
Encouraged by the performance, 4399 will continue scaling with RiverAds to grow Legend of Mushroom in Japan. With Playtime's engagement-first format and a data-led approach, the team is set up for sustainable growth.
Day 7 ROAS soared over 32%: a major leap in campaign performance 32%
"The RiverAds channel offers high user quality, reflected in its clear cost advantages as well as retention rates and early-funnel event completion rates that are above market averages. It has been highly valuable in expanding our game's user base and strengthening the game's ecosystem."
Zhang Jia Cong
Optimization Manager
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