You can carry out a light combo by tapping, and a heavy combo by swiping several times. You can make your robot block by holding down two fingers on the screen. Attempt to develop a team around same synergy to get better results. Each robot belong to a "synergy team" and when your team is set out of robots from a complete synergy set, they will all get a little passive bonus, like enhanced armor and greater attack power. Each robot has three slots for power cards and they enhance robot's stats, such as damage, armor, and recharge time.