This is a really fun game, if you've ever played mafia or werewolf this is similar! Be sure to either download the app for the voiceover at the beginning or jump on youtube and It is on there.
It allows you to choose which characters are playing in the round and then tells merlin to open his eyes and then close percival to open his eyes and merlin raise his thumb etc. Just makes sure a slip of the tongue doesn't accidentally give away something!! Also the voice acting is hilarious :P
Have had games take 5 minutes and others 30 minutes+ really depends on who is playing and how the first couple of rounds go!
GG assassin ;)