3 or More
Each player takes a turn being the timer and being the artist. At the start of each round the person doing the timing whispers a word into the artists ear. (making sure no one else hears) Then starts the clock.
As the artist draws, the rest of the players must guess what it is. The longer it takes to figure out the more you will have to drink. For every 20 seconds that has passed before the correct answer is guessed, the guessing players must take one drink. For example, if someone guesses it correct after 1 minute 20 seconds everyone would have to take 4 drinks.
If someone guesses it correctly in under a minute they get to nominate someone to take a shot. Maximum amount of time a game can run for it 5 minutes.