Nowadays, any smartphone or tablet user can play slot machines online without any restrictions. All you need is an internet connection. No software, plug-ins or applications are required. All you need to do is to launch your browser and log in to the online casino. Only the best casinos that you can find on the website allow unregistered players to check out their games for free without making a deposit. Some of them even offer free spins bonuses and the chance to win real money, despite the fact that they don't need to deposit any chips. Nowadays, online slot machines operate on the basis of an algorithm that determines the payout percentage for randomly selected players. Each slot machine has a different threshold, and it is impossible to predict or calculate when a prize will be paid out.