Online slot games make use of a Random Number Generator (RNG) to create arbitrary and unpredictable results, and they are examined by third-party companies to ensure they meet a requirement of randomness to maintain fairness. RTP, or Go back to Gamer rate, is a sign of just how likely a port video game might pay genuine money in the long term. For instance, a port with an RTP of 97% may in theory pay ₤ 97 for every single ₤ 100 it takes in.