Featuring a 5×3 grid and 10 paylines, this classic slot also comes with no fewer than six bonus features. The latest offering from Barcrest is Rainbow Riches Power Mix, which launched in 2021. The Rainbow Riches franchise is one of the biggest around. This will include their gameplay and bonus rounds, including the new slot casino where they can be played: 1. Below, we take a closer look at our top ranked newest slots available in the UK.