Do you remember those "Choose your own Adventure" books? You know, "If Josie a) goes into the library turn to page 42 b) stabs the griffin with a fork turn to page 46 ....". Well those were the precursor to computer based adventure games (starting with text based games like Zork and then evolving into MMORPGs like WoW). Well now you can create these types of games as tutorials for courses using YouTube and their Spotlight tool.
You can find a tutorial here where they use the example of preparing for the GMAT.