Ordinary people just can't do what professional gamers do.
Players can compare where they're looking with professional gamers, to watch where they're going wrong.
And that market extends from professional gamers at high-end computers to those at more humble PCs.
But get closer, talk to professional gamers, try it yourself even, and the differences start to become clear.
In South Korea, for example, the industry will play host to arenas full of fans watching professional gamers, with some prize pots for tournaments of several million pounds.
It is one of the most watched titles on the video game streaming site Twitch, and professional gamers can earn tens of thousands of pounds in dedicated tournaments.
Fields is polite, extremely articulate, and until a fortnight ago was one of the highest-profile and highest-paid professional gamers in the world.
Professional gamers follow a track similar to professional golfers, entering several tournaments a year and collecting prize money, said Brian Balsbaugh, founder of the eSports Management Group, an agency that serves pro gamers.
Professional players are fit for nothing Recent research shows that while many professional gamers boast the samereaction times, motor skills, competitiveness and emotions as elite athletes, physically they can't compete, with worryingly low fitness levels.
Another organiser of gaming tournaments is World Cyber Games, which is hosting its Euro Championship in March and is expecting 200 professional gamers from 20 European countries to battle it out against each other.
