An example of engagement that resonates is the Pensions Calculator created for Aegon.
Aegon were looking for a means of highlighting the importance of a setting up a pension and in particular to leverage their sponsorship of British Tennis and promote this to their target audience.
They needed something engaging, subtle and memorable. Standard pension calculators are exactly that, calculators. They are common enough in many forms and used so frequently in so many applications that none stick in your mind. We may use them occasionally to see how much you need to save for a pension, feel a bit worried but shortly thereafter you forget about it and move on to more immediate concerns.