Quandary is a web-based educational game – I remember playing it with my teenage EAP students 5 years ago, and the website is still working. It’s short, very easy to use and has a lot of great language with a slightly academic feel.
According to its creators, Quandary also “engages your students in ethical decision-making and develops skills that will help them recognize ethical issues and deal with challenging situations in their own lives”.
In a nutshell, you make decisions and then see their consequences. How’s that for developing critical thinking or leadership skills?