First of all thank you for this wonderful tool ! It was almost exactly that I was looking for! Except for some little details that I'll describe below:
1- I would like to use this Memory Game to give prizes or coupons to my logged users. It means that I would like to give them the possibility to play just one time ! Once finished, even refreshing the page, they cannot play again. They could play again only if I decide to give them a second chance ! (For example: when two users had equals results playing).