If you are from the USA, there are alot of tournaments you can play, for free or with a small fee
You will find on weekly base, new tournaments at these casinos
the tournaments are played on slot machines, you get a sum of money to play your tounament, if your time is up, you can buy more if you think you can win!
no need to deposit if you only play the sum you get for free, but if you want to be on top, it's somethimes needed to deposit so you can play on, to get the first plays and win the 1st prize!
US can play at alsmost all RTG software casinos onlinesoftware casinos