Q: In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
Article: Big messaging apps abroad While WeChat is China's biggest mobile messaging app , there are many equivalent apps in other countries that offer similar features. WhatsApp (US) Users: more than 300 million Platforms: Android, iOS, Windows Phone, BlackBerry Features: text chats, pushtotalk, file sharing, location sharing With more than 300 million active users, WhatsApp is one of WeChat's biggest competitors. Developed by two exYahoo employees in 2009, WhatsApp originally focused on text chats, but on Aug. 6 it also started pushtotalk service. It's noted for its accessibility, ease of use and the absence of adverts. The service is free for the first year, after which D|S0.99 (6.06 yuan) is charged for a oneyear subscription. Kakao Talk (South Korea) Users: more than 100 million Platforms: Android, iOS, Windows Phone, BlackBerry and Bada (an operating system developed by Samsung) Features: text chats, group chats, pushtotalk, group calls, file sharing With more than 100 million users in more than 230 countries, Kakao Talk is a multiplatform texting application that allows users to send and receive messages for free. With Kakao Talk, users can message each other oneonone or in group chats with unlimited numbers of friends. You can also choose from more than 250 animated emoticons and share them with friends. Line (Japan) Users: more than 200 million Platforms: Android, iOS, Windows Phone, BlackBerry and PC Features: text chats, group chats, pushtotalk, file sharing, location sharing, gaming, stickers Line tops the list of the most downloaded free apps in 52 countries. Apart from text and voice messaging, Line provides its users with more than 250 original stickers and emoticons to buy from its own shop. In the first quarter of 2013 alone, it made D|S17 million just from stickers. The popular app also allows friends to battle each other in the Line games.
Answer: Group mobile games.
A:
Compared with the other two apps, which of the following features makes Line stand out?