Now you are level 61+ players, and will recognized now as Expert Players. All basics you need for Expert Levels are already explained before in previous three levels. All you need now just read some other guides and explanations throughout this wiki and CoM Forums, and you will master this game.
But, there are three primary feature you need to master in this level, they are:
In addition to knowing the above portions of the game, one of the most important buildings in the game is gained at Level 85, your 2nd Tower. Training at higher levels requires an immense amount of XP and the second tower greatly increases your XP gained through training. It's a must for any high level player who doesn't want to spend months training each hero...
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