There are thousands of different online slots available, all of which come with individual payout percentages. Slots generally hover around the 95% range or higher when it comes to RTP %. They are said to have the highest possible casino payouts of any casino game. Since most of these games are based on luck, slot games tend to offer a high RTP %, but the really big wins are quite rare. On each of our Canada online casino reviews, we list some high paying slot games to give you a head start. The progressive jackpots rely on combining the spins of many players to create collective prize funds. There top 100 in online casinos are also slots tournaments where you can play against other slots aficionados for extra prizes based on a leaderboard. The return to player rate is calculated by the software developer that designs the game. A team of mathematicians measures the RTP rate based on the outcome of a certain number of spins. Players and casino operators cannot manipulate the RTP.