All the bonuses and promotions at Las Atlantis are designed for a specific type of game. If the terms for the specific bonus in question state that it can only be used for slots, then you can really only use it to play slot games. Also, you have to keep in mind that each bonus has special wagering requirements that have to be fulfilled before you can withdraw your funds, along with the maximum allowed bet of $10. You can read a more detailed explanation of each process on Terms and Conditions page.