A record USD 33.5 million is up for grabs but professional eSports players like those competing in The International in Shanghai this week pay a physical price with deteriorating eyesight, digestive problems and wrist and hand damage.
At first, Evgenii "Blizzy" Ri looks perplexed at the notion: "It's impossible, how can you get injuries when you play games?" Then the 24-year-old from Kyrgyzstan discloses that a doctor urged him to take six months off to give his failing vision a badly needed rest.
Ri plays for Natus Vincere, or NAVI, and this week is competing in The International, a world championship said to have the biggest prize pool in the history of eSports.
NAVI and 17 other teams will play the multiplayer battle game Dota 2 in front of thousands of fans at a major indoor stadium while hundreds of thousands more will watch online.
If NAVI triumph on Sunday, Ri and his team-mates will become instant millionaires -- but success could come at a price.
"I didn't worry before but now I feel like my eyes are really... I can't see so much," said Ri, who practises up to 12 hours a day.
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"Ten years I've been playing computers so they are a bit... I've just got bad vision.
Ri has been told to wear glasses but he does not find them comfortable and said that his deteriorating eyesight does not hinder his performance because the screen is up close.
A doctor recommended simple eye exercises -- moving them up and down, left and right -- but he admits that he does not do them.
"Actually he also told me not to play the computer for six months to get back my vision, but I didn't listen.
"I need to play."