Jackhammer Rivals was a game at the Stadium Games which took place at the Stadium. The game itself was an event in Club Penguin. The objective of the game was to get as many people drilling on that color. The players on a color, would change the decorations. There were four colors which were Red, Blue, Green, and Yellow. The spot that has the most penguins changes the color of the whole stadium. If no one is playing or two spots have the same amount of penguins drilling the stadium would change a random color. The drilling would count if you are using other colored helmets such as the red, yellow, orange, or green helmet. Of course, players require a hard hat to play.
The decorated Stadium where Jackhammer Rivals is set (top-left).