The BUX battle is a small competition that you can create with friends or randoms, it's a small space where you battle each other on who can achieve the most return on their investments within a certain amount of time. 

The moment you create a battle, people are able to join. Once the battle starts all positions are taken as equal and the BUX app starts counting. The person that can achieve the most return within the duration of the battle wins! 

Good luck!