this is so easy! make your goal to collect the red ones and eventualy you'll get up to around 30. then whenever u see a big group use the transformation thing to see if they turn red. if not use the "claim them as red" special. go for red ones every time! even if its just one beside u. itll take up a move, give u points, and give u 1 life.
i used to play this game 2 years ago at school! at the end of the day the teacher would let us use the computers for like half an hour. it was so much fun!