The bonus can only be used on limited kinds of games at a casino site. These types of games are picked by the casino, although, in most cases, they are online slots, video slots and video poker games. Some casinos es at the casino with some exceptions, most likely table games, live dealer games and lottery games.
In the second case, the bonus will only be valid on specific games, not types of games. For this type of restriction, the casino will indicate what games are eligible by title, for instance, free spins bonus on Starburst online slot. This should be stated upfront and in the terms and conditions. This will vary by casino and could be changed regularly based on what game the casino wants to promote or any other reason.
Sometimes, the casino can limit the bonus to a list of games from a particular software provider. Read more