Wordament is a boggle styled Xbox Windows Phone game where you have to create words from a 4×4 grid of letters. You earn points based on the letters used and compete against thousands of other Wordament players to earn the most points.
Wordament was recently updated to version 2.5 and adds the ability to login with your Facebook account so you can play against your Facebook friends. You can still log-in with your Windows ID with the Facebook log-in being optional.