Add multiplayer functionality to existing iOS app

*** This is a project for the worker / team InInnovations only *** InInnovations, this project is to add multiplayer functionality as discussed. The app must continue to work for all iOS devices as it does currently. Multiplayer will allow users to play a game against a random opponent or invite their friends from GameCenter to play against. When inviting friends, the user creating the game must choose a difficulty. When playing against a random opponent both users must choose a difficulty and only people playing the same difficulty must be matched. The users don't have to be online at the same time to play. This means that the multiplayer functionality is very similar to "Words with friends" where each person can play whenever they want. They get the same questions and images and whoever scores higher with 3 lives wins. If there are any questions about what I'm expecting in terms of functionality or how something should work please ask me. If you need help at a code level I will also be glad to take a look and help as time permits. Please also let me know how much you would charge for completing the UI implementation if I share the PSD files and the font files. If the price is good then I may get that done as well. Thanks and I look forward to working with you again.