Tic Tac Toe using Corona SDK Lua

I have created a Tic Tac Toe app using corona sdk and these are what i wanted in the app.  Allow a human to play vs. “the computer”  Allow a choice as to who goes first  Keep track of the moves made and be able to show the winner So i have managed to achieve the above tasks and now i want the below requirements to be added to my existing app.  Implement a winning strategy for the computer (figure 1). (I will give you this figure when u contact me)  Keep track of the number of wins/losses/draws across separate invocations of the app i.e. persistent storage  Allow these scores to be cleared  Allow a human to undo his/her last move within five seconds of making a move  Replay the last game in order of the moves made by each party  Implement a three-level difficulty scheme where easy = computer plays randomly, hard = computer plays with logic in figure 1 and medium = computer uses random placement on odd turns and figure 1 on even turns . Black box and Unit tests. If anyone interested contact me. Thanks.