Robo Rumble is a game mode in which waves of robots will try and destroy your safe. In the first wave, only 2 bots spawn, and every wave successively will have one more bot than the last wave. There are a total of three boss rounds and each boss will be stronger than the last one. After a Boss round, the number of bots will reset back to 2. The regular waves last for 13 seconds while the boss rounds last for 22 seconds. If the bots stay more than 90 seconds on the map they will gain a huge speed boost.
A Robo Rumble map is the same size as a showdown map. The bots will spawn in a 360-degree area near the edges of the map. The map walls can be destroyed so you have to be careful with supers that damage walls.