No doubt about it the levels are hard and they get harder as you go through, especially if you do not have the characters mentioned in this thread. As others have said Assassin Demon Spawn (failry easy to get compared to Prisoner) and Iron Eddie (again, usually OK to get as only a four star) are a decent team for sure. U did the early levels with a team based around them then I switched to a stun based team with Horus and Prisoner with DDE (again DDE is reasonably easy to get as a four star). There are other teams I am sure but those are the teams I used.