Here's an online resource that requires little in the way of previous knowledge and can be used to introduce some macroeconomic concepts.  As such, it may be useful as a homework for new students, a classroom activity at an early stage of delivering macroeconomics or as an activity for open evenings or orientation days.

Called 'Prime Minister for the day' it asks the player to imagine that they are PM for the day and must choose 4 macroeconomic policies from a list of a possible 18.  Each policy will have a positive or negative impact on price stability, unemployment, economic growth and the environment.  Just to add a little twist, a random 'external shock' can appear to makes things a little more difficult!