Tokkuri is a traditional drinking vessel from Asia. Drink up Tokkuri flasks of sake and collect the empty Tokkuri. If you don't have enough sake on the table, add more Tokkuri. You can serve them as much as you like. However, you lose points for any Tokkuri with sake remaining in front of you at the end of the party. The player who serves the right amount of sake while collecting as many Tokkuri as possible wins the game.
