Update:

see deal Gran Turismo 6 - Playstation 3 $39.99 on Gamestop

On his Twitter feed , President of Sony's Worldwide Studios Shuhei Yoshida defended microtransactions in Gran Turismo 6

"Microtransaction per se is not a bad thing," he went on to write. "How the game is designed around it could become a problem."Is he right? Race back to IGN on Friday to check out our review of Gran Turismo 6.

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An update to the PlayStation store has revealed how Gran Turismo 6's microtransactions will work.We told you last month that GT 6 would be the first entry in the popular racing franchise to allow you to trade real-world cash for in-game cars , but at the time we weren't aware how much it would set you back. Now, that's all changed.You'll be able to buy in-game credits in denominations of 500,000, 1 million, 2,500,000 and 7 million. The cheapest pack is set to cost £3.99/€4.99, while a million will cost you £7.99/€9.99 and you'll need to exchange £15.99/€19.99 for 2,500,000 credits. As you'd expect though, the best value pack is the one containing 7 million credits, which sets you back £39.99/€49.99. We're still tracking down US prices, and will update this story when we know more.When microtransactions were originally announced, we included an image that offered some insight into the different cars you can buy . But how much will it cost you to buy the most expensive car in the game, the Jaguar XJ13 if you want to do it with real-world money?Well, it costs 20 million credits. While you can always grind these the old-fashioned way (by playing the game), the speedy/expensive way will require two packs of 7 million credits, another couple of 2.5 million credit packs and a final pack of 1 million. That'll cost you a stonking £119.95.The real question is whether the introduction of microtransactions will adversely affect the traditional Gran Turismo progression system. Those with concerns should remember it's entirely optional, so if you'd prefer to earn all vehicles and upgrades through simply playing the game, you can.Keep an eye on IGN this Friday for our Gran Turismo 6 review.

Luke Karmali is IGN's UK Junior Editor. Some people think he looks like Tom Daley. You too can revel in mediocrity by following him on IGN and on Twitter