The online number guessing game is a game developed based on WeChat to guess the number of people online in QQ at the same time.

QQ is an instant messaging software launched by Tencent in 1999. It can not only chat and make friends on various communication terminals, but also make free video and voice calls, or send and receive important files anytime and anywhere, and communicate with Mobile communication terminals, IP telephone networks, wireless paging and other communication methods are connected.

Tencent QQ supports online chat, video chat and voice chat, point-to-point resumable file transfer, shared files, network hard drive, custom panel, remote control, QQ mailbox, offline file transfer, etc. functions and can be connected to a variety of communication methods.

In February 1999, Tencent officially launched the first instant messaging software-"OICQ", which was later renamed Tencent QQ.