The legalities of playing slot machines online for real money can be rather complicated, and it will ultimately be dependent on just where you live in the world as to whether you can play any of your favourite slots, and plenty of other ones besides for real money online.
What you are going to find these days is that most countries of the world will have in place a Gambling Commission or Gaming Authority who are tasked with regulating both land-based and online/mobile casino sites.
Therefore, you should always make a point of finding out if your country has such a regulatory body in place and then only ever play at casino sites that holds a full and valid gambling license in your own country of residence.
Players that live in a country where online gambling isn’t regulated can of course play at casinos that are based in other parts of the world, however there can be all manner of pros and cons regarding doing so.
What you will need to ensure you look out for when playing slot machines or any other gambling type game online is that the casino site you are thinking about playing them at is licensed somewhere, and that the games on offer have all been independently certified and verified as being completely fair and random too.
Also stick to playing only at those casinos that allow you to make deposits, play and also cash out your winnings in your home currency, for you will end up paying currency exchange rate fees and your bankroll and any winnings will always be at the mercy of currency exchange rate fees if you have to set your casino account to any other currency.