Diablo 3's real-cash auctions begin in the Americas
Diablo 3 sold more than 3.5 million copies on its launch day, a record for a PC title
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The publisher takes a cut of each transaction, securing a new source of profits.
It has warned that subscribers found guilty of using hacks or other attempts to cheat face a lifetime ban.
Diablo 3 takes place in a horror-themed fantasy world in which players team up to save their land from monsters.
Activision Blizzard has launched the video game Diablo 3's real-money auction house for players in North and South America.
The facility allows users to buy and sell objects found in the title using real currency.
Its in-game auction houses - in which gold, weapons, armour and other materials can be bought and sold - were originally supposed to have been launched on 22 May.
However, the move was delayed following reports that some users had had their accounts hacked, and that items and characters had been stolen.
Small steps
Blizzard has now opted for a more limited launch. Auctions are initially restricted to equipment - commodities will follow at a later date - and several currencies including the Brazilian real and Argentine peso cannot be used yet.
"We are rolling out the elements of the real-money auction house separately to ensure all of our players have the smoothest possible experience," it said on its blog.
"We'll have more information on the availability of the European real-money auction house and the remaining American currencies soon."
The firm has also introduced a range of security measures.
Players wishing to pay for transactions through its proprietary Battle.net system must either download an identification app to their smartphone or buy an authenticator - a physical device that produces a digital code.
Those wishing to buy goods via PayPal must sign up to a separate service that messages a special code to their phones which must be re-entered to complete the transaction.
The game's auction houses allow players to buy or sell items for real-world money
Chinese bots
The Tech in Asia blog reports on one of the potential problems facing the title.
It says some users there have already created software applications - called bots - which carry out automated tasks in the game.
Blizzard has said such activity constitutes a breach of its rules.
A recent forum update noted that "several thousand" players had already received account suspensions and bans for "cheating and/or using botting or hacking programs while playing".
The firm has invited users noticing suspicious activity to email its teams so it can look into the problem.
"Blizzard is legitimising the process of players transacting between themselves within the game," said Ed Barton, director of digital media at Strategy Analytics.
"This has been happening for some time in other online games but often it was user-driven and only grudgingly tolerated by the game's operators.
"I think it's going to be a little while before the whole process settles down as far as Diablo 3 goes and there may be some odd occurrences such as wildly fluctuating pricing in the meantime. Cautious gamers may wish to wait before getting involved."
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