Box Simulator Gray Brawl Star is a simulation app developed by HHLove Box for Android. It is a fan-made app and not affiliated with Supercell. The app is a crate opening simulator for Brawl Stars, which allows users to open boxes and get a chance to collect all brawlers in the game.

With Box Simulator Gray Brawl Star, users can open boxes and get a chance to win new characters and achievements. The app also provides the chances of opening boxes and getting a brawler out of the box in Brawl Stars. It is a fun way to complete the Brawl Pass and Trophy Road, get daily gifts, and participate in events.

The app is free to use and offers unlimited gems and coins in Brawl Stars 2D. It also allows users to create their own brawler for Brawl Stars and try it out in the Box Simulator. The app includes leaderboards and a lot of interesting features that make it a must-try for Brawl Stars fans.