Robo Rumble includes three players battling against as many waves of robot enemies as they canto protect a safe. The first wave starts at 2 seconds and each wave lasts 13 seconds after that. There are four robots in the game mode. The first robot is a “melee robot” with high hit points and a low range. The second robot is a “shooter robot” with low hit points but high range. The third robot is a “mini robot” with low hit points with high speed. The final robot is a “boss robot” with very high hit points and high damage. The boss robot has a melee attack and can shoot rockets. The boss robot appears every 7 waves. All bosses will make robots that spawn after him stronger, do more damage, and have more health. You lose once the safe is cracked open.