Here's a Verbal Baseball Game.  You divide into two teams and a student comes to the plate, and asks for a certain pitch: a single, double, triple or homerun, and then you basically "throw them" a question with the corresponding degree of difficulty. 

You might need to add some questions to the handout.  I'm new to Korea and I'm still adapting to the level of students here.  But it provides a good framework. 

Thanks. 

Kevin