Board Thread:Tips, Tricks, and Questions/@comment-150.177.11.18-20130919103712/@comment-21492862-20130920112025

You can see the different tiers of the monsters by opening the storage with your monsters by pressing the 'Mgmt' button at the top of the screen. Then press 'catalogue' in the top right corner and you will be able to see the different monsters and their tier.

More stars means that the monster got a stronger passive skill. You can see what passive skill a monster got and what the requirements are to have it activated by pressing the desired monster.