Underworld: first AppStore MMO featuring in-app purchase micro-transactions

Today, a new version of Underworld appeared in the AppStore. The one unique feature you will notice there is in-app purchase mechanics for paid in-game extras.

Right now, Underworld is the first MMO in the AppStore that has micro-transactions, so we decided to drop some knowledge on the whole micro-transaction deal and what troubles we were facing while working on it.

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