It is a little geeky and works by clocking your oyster in different locations. I do think if you got into it might spice up your commuting to work and you could take on their missions of the day to gain extra points for your team.
While you are doing it think of it as a mini workout and walk/run up all the stairs and escalators walking as quickly as you can through the tube tunnels.
Like normal it is all about fitting exercise into your day so why not spice it up by making it into a game!
Have a read of the review in the Guardian http://www.guardian.co.uk/media/pda/2010/nov/30/chromaroma-oyster-transport-gaming I think they have a point about launching it the day of the tube strike was on – lol!