The Bomb

For this game you need a countdown timer that makes a sound when it has finished. As the timer is counting down - hide it. Now, you can revise any number of possibilities going around the class from student to student. For example: vocabulary sets, things you do on the beach / at school etc. or word chain games all with the lingering tension that when the timer goes off the person whose turn it is currently...

IS OUT.

You could use an interval timer online so the timer keeps going but goes off at different times.