Great little plenary chooser that your pupils will get used to fast. I recommend picking up a few D20 dice (10 for £3 on ebay) and giving one to each group.
Then when you want to check understanding either at the end or part way through a lesson they roll the dice and do the corresponding activity.
Pupils enjoy having a semblance of control but you still get the required plenary. If you want a more controlled experience have one pupil roll the dice and every pupil has to do that specific plenary.
Digital dice rollers are also available online.