Yea it is hard to lvl up. I have been playing that for 3 weeks and I'm still on lvl 16. Now i stop playing it coz there is not a lot of things to do in the game exept for trying to lvl up.
i hav played this game for 4 months and i think its is not worth buying unless you like looking at the good pictures.
i give this game 6/10 because of the good graphics.