In pairs, the students play Tictactoe by asking questions corresponding to the space they want to use. They then play janken for their partner to determine if they answer yes or no. Because each student has a worksheet the pairs can play tic tac toe twice. once usuing one partners, then switching ans using the next students. After they have both played, have the students write the winning questions and answers. If there is a tie, they can just choose three questions at random.
I am not sure why, but when we played this the first class, there was so much confusion about what to do. We had to run through an example on the board with me and the JTE several times before the students sort of understood what I wanted them to do. They understood the grammar, but the janken for the answer tripped them up.