Just to check, can I make paid version with only added GameCentre feature

Appster

Hi all, will this be allowed? Currently my apps is free version. So do I update with a new version or submit a new app instead?

http://i-am-appster.com/

MarkOnTheIron

Update it and leave it free. GC is not enough to justify a paid version of a game.

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【ツ】iPhone Icon Pack 【ツ】 - 【ツ】Graphic Pack【ツ】
Free GS demo: High score simple and advanced; Game Center; App Rating System

JeffreyShimane

From a technical standpoint, you can change the price of your app from free to paid (and back) without adding anything. Go into iTunes Connect and change the price tier. No update required.

Changing it to paid won't affect those who got it when it was free (they will still be able to update it with GC for free). For those that haven't bought it yet, is the addition of GC enough to convince someone to buy it? That's debatable. For some people, lack of GC is a deal-breaker. Others do not care. Ultimately, you must decide how to best market and sell your apps as the sales go to you.

- Jeff