Apart from William Hills big spin and BuzzBingo’s daily circus spinner, all other casino offers are not risk free, profits are potential profits and there is a risk of losing money. I follow rules when completing all casino offers that limits the risk and maximises chances of a profit. Check out my long term matched betting article to find out more on this.
When wagering on slots i will always try to wager on Bloodsuckers slot as this has by far the best rtp%. If Bloodsuckers is not available i go for Big Bad Wolf or King Kong Cash, although these both have a high variance.
There are many more casino offers i complete although these are adhoc offers that can be found on the Oddsmonkey daily offer calendar or emailed directly.