That it is a huge question and depends on the class and the desired outcome I have two main classes where I use gamification activities: Sustainability & Environmental literacy (mainly for seniors and juniors, an elective class) and New Media Skills & Online Technologies (mainly for seniors, an elective class). IN the Sustainability class, I use the ARG concept as the delivery mode for certain content and skills. In the New Media class, we have actual units on gamification as well as other technology and Maker topics. So we use ARGs to look at content, But, we also look at the concepts of making ARGs and gamification. I also use ARGs as a form of problem based learning - which means students are presented a problem and have to figure out a solution. I like how ARGs are a nifty way to teach students how to assess an issue, determine what is needed for crafting a solution, how to research and formulate plans, how to take pieces of information from assorted places and put them together, how to keep at a problem even if you fail or the solution is not automatically found, how to use technology skills in assorted ways, how to curate/organize/share information and practicing social community interaction and cooperation toward a common goal (AKA the dreaded I hate working in groups and group projects).
I start in both cases with looking at what is an ARG - I use Extra Credits and other videos to talk about ARGs and I share my experience (I have been ARGing since before the Internet existed We talk about why people use them and how people interact in these types of situations. From there, it depends on which class I am working with, if this is the first time using this method of content delivery, the level and ability of my students and what the intended outcomes are.
I can go into even more details if wanted : )