Google how to play "The Battle Cats" right now. That's how you play. Good luck. For the Equip Menu, drag units into slots or click the "Clear Selected Lineup" button to move all units out of slots. Click the Mystery Units or Platinum Mystery Units to get a random Rare unit (aka gambling)! (NOTE: Platinum Mystery Units have a much higher chance of being a higher rarity.) Click the Unit Boys or Enemy Boys button to learn about units/enemies you've seen. Click the Change Difficulty Button to change the Enemy Modifier midway through a playthrough. Use the arrows next to the "Play Level:" counter to select which level you will play next. Levels can be replayed but no extra rewards will be given, besides rewards that can be acquired on any stage by a specific means (i.e: Lil' Basic Boy, Archer Cannon). You can also get capsules for replaying a dojo stage. Unit buttons are bound to keys 1-5, or can be clicked with mouse. The Rich Boy Level up button can be clicked with mouse, and is bound to 6. The Cannon fire button is bound to 7 (and can be clicked with mouse).
Sorry for long load time :P NOTE: You can select any number of Special Modifiers, but only 1 Enemy Modifier. Enemy Modifiers may be changed in the Equip Menu.