1.- Update to iOS 4.1
2.- Go to Menu and choose Minigame
3.- Create your account if you don't have one
4.- Now select the number of players and be patient
5.- Now here comes the fun! , you'll play a role, Medic (band-aid), Firefighter(fire), Cop(police paper) and Constructer(brick), you have to tap A LOT of times the icon you must press, if you are medic, band-aid, cop, the police thingy, etc, and also... MOVE FROM CITY TO CITY! It's crucial to earn that River
(That little symbol over the city marks what thingies to tap are available, don't get confused!