China is tightening its surveillance after an online "suicide game" called "Blue Whale" is preying on teenagers and young children. The challenge is also causing global concerns.

The online challenge game, believed to be originated in Russia, starts by asking participants to draw a blue whale on paper. And from here, the challenges gradually become twisted, creepy, and physically harmful.

Like Us on Facebook

The online game requires players to complete 50 tasks, one task per day. Xiao Yang, who claimed to be the vice president of Blue Whale's China Bureau, listed 50 challenges for the players to complete, including "cutting your arm along the vein with a razor; stabbing your hand with a needle repeatedly; don't talk to anyone all day; and accept the date of your death," state-backed Xinhua News reported.

Players are required to send photos to the creators to prove that they have successfully carried out the task. But the ultimate and final challenge the player must comply to win the game is to commit suicide.

Chinese authorities discovered that a group on Tencent's messaging app QQ was locally sending out invitations to young people.

"Those who would like to join in the game must get up 4.20 am tomorrow. I will send you a horror movie and you must watch it alone, or face the consequences," the disturbing instruction and warning read.

It is said that the creators of "Blue Whale" suicide challenge target vulnerable teens online before they are asked to download the app and participate in the challenge. As soon as the app has been downloaded, users' phones are reportedly hacked and the game can no longer be deleted, giving perpetrators access to all personal and sensitive details.

The online group connected with the Blue Whale said to have thousands of members and subscribers on Facebook and YouTube. It also has spread in other countries including Ukraine, Spain, Portugal, France, and the UK.

So far, there has been no reports of players committing suicide in China. However, the game has been linked to hundreds of death worldwide and at least 130 teen deaths in Russia. The Blue Whale craze first reached headlines after a 15-year-old Russian girl posted a photo of a blue whale on Instagram before jumping to her death.