Free-to-play mobile RPGs often use the gacha system as a monetization strategy. In this system, players spend virtual or real currency to unlock random characters, items, or power-ups. This mechanic is similar to the concept of loot boxes, where the contents are unknown until after the player has spent their resources. The gacha system is especially common in role-playing games (RPGs) where players collect powerful heroes or items to strengthen their team. Games like Fate/Grand Order, Fire Emblem Heroes, and Genshin Impact have made the gacha system a central part of their gameplay.

The appeal of the gacha system lies in its addictive nature, as players are often drawn to the chance of unlocking rare or powerful characters. While gacha mechanics have been criticized for encouraging excessive spending, they remain an effective way to monetize free-to-play games. Developers often introduce special limited-time events to keep the gacha system fresh, giving players new chances to collect exclusive characters or items. The system has become one of the most successful monetization models in mobile gaming, driving revenue while keeping players engaged through constant updates and new content.