They’ll usually be offered as sign-up bonuses, so you’ll have to sign up to receive them. Once you’ve done that you’ll be able to use your no deposit bonus, keep what you win and continue playing the casinos varying slots. Yes, you will often find that the games you can play with your no deposit bonus spins are limited to a certain selection or even a specific slot title. Always double check the terms and conditions so you know the game you’ll be playing before you sign up and register.