Its easier than the GBA version IMO though (which still wasnt hard) but im beat both sides once already and im playong Sora's story again on Proud Mode doing the No Upgrading HP challenge im on lvl 21 and im on Monstro (which happens to be my last one of the first set of cards) its still pretty easy though all you have to do is learn how the cards work and when and how to use them. xP