Can the casino change the payout percentages of the games? No, Each slot machine comes from the factory set at a specific payout rate. There are some people who use techniques to cheat but these are generally illegal and they tend to end up with a mug shot on the Nevada Gaming Commission web site. There is no system to beat the modern day slot machine that actually works. Can you recommend a good slot machine system? No. Because video slots have virtual reels they have no need to weight the individual symbols they just add fewer of the highest paying ones and more of the lowest to the virtual reel which can contain anywhere from 10 to hundreds of symbols. Are the symbols weighted like on three reel slots? In general no. Are the outcomes really random? Yes, every spin is totally random and in no way effected by the amount of money you put in, the amount of your bet or the time between jackpot hits.