If you need a slot on Android, IOS, or PC not for earning, but solely for pleasure, then it makes sense to use the demo version. You can download a slot machine to your phone in just a few minutes using a search engine or by directly following the link provided by a virtual gaming club. Using the demo mode does not require registration, verification, or account top-ups, so there is no risk of financial loss.
By the way, you can download the Aviator game for money crash for free, and then after a few trial rounds, reconsider your decision and become a client of an online casino to aim for a real win.