Play this game on a real computer.
It requires flash, so I don't think it will work on your ipad.http://www.nobelprize.org/educational/medicine/bloodtypinggame/gamev2/index.html
The scientist that figured out there are different blood types won a Nobel Prize for his work. To learn more -
http://www.nobelprize.org/educational/medicine/landsteiner/readmore.html
