About your question - I think you're talking about
case battle, and that's a really interesting thing. It's one of those features that combines the element of randomness and competition. On sites like “CSGOEmpire”, you can engage in battles like this, where you open cases at the same time as other players, and one of you wins the entire contents of the case. It's pretty exciting, especially if you're playing in a team with friends. The idea is that everyone takes turns opening their briefcases, and then the result is shown, and the winner takes all the items collected during that time. This adds a special element to the game, and on such sites, there is always a variety of cases, from cheap to exclusive and expensive. But don't forget that it can be quite risky, as it all depends on luck and also on what kind of bets you place.