With our free online roulette simulator, you can learn and understand the aspects of probability, logic, rules and strategies without any financial risks. We offer the games for fun and research. They are free. Roulette is a fascinating game and is considered a fair gambling game because the course and the result depend solely on chance. A moderate advantage for the promoter reduces the chances of winning by and large only slightly below 50 percent. 18/37-48.65% in European Roulette and 18/38 -47.37% in American Roulette.