Werewords

In Werewords, players guess a word by asking "yes" or "no" questions. Figure out the magic word before time is up, and you win! However, one of the players is secretly a werewolf who is not only working against you, but also knows the magic word. If you don't guess the word in time, you can still win by identifying the werewolf! To help you out, one player is the Seer, who knows the word, but has to be careful while helping you. If you guess the word, the werewolf can pull out a win by identifying the Seer!
A free iOS/Android app provides thousands of words in hundreds of categories at various difficulty levels, so everyone can play.