Facebook forced

I am a classroom teacher who wants to use this app for math skills practice. I want the students to compete against each other, but the app forces you to join FB. Facebook is blocked in our school system. There should be other ways to play against others i.e.: Bluetooth, WiFi Local or Username Friend List. The app gets 5 stars for the challenging 24 cards, but I’m giving it 2 stars for not providing other ways to compete against others.

Smileyleg about 24 Game – Math Card Puzzle