Underground Labyrinth Strategy

I recommend placing 2-3 super rare units in each stage, depending on the number of super rares you have. Save the ones that deal with steel enemies for later, otherwise you won't be able to pass. In the early stages, deploy a lot of miscellaneous units. In the mid-game, you'll need to add some strong rotating characters. In the late game, you need units effective against specific types, and here's another important point: Don't get too greedy and deploy too many miscellaneous units. You might break your frontline and lose a lot of cats. Hope you all can clear all 100 floors!