It depends on the specific terms and conditions of the casino bonus. Some bonuses may only be applicable to certain games, such as slots or table games, while others may allow you to use the bonus on any game of your choosing. It's important to carefully read the details of the bonus offer before accepting it, as well as the odds and wagering requirements for each game. Additionally, certain bonuses may require a specific promo code to be entered in order to be eligible for the promotion. Ultimately, it's up to the online casino operator to determine how their bonuses can be used, and it's up to the people taking advantage of those bonuses to ensure they're using them in a way that gives them the best chance to win.