slots with the best rtp

List of High RTP Slots. Book of 99 (99%) - Right at the top of my list is Book of 99, offering, as the name suggests, the mind-blowing RTP percentage of 99%. This highly volatile slot comes with a pretty standard 10-payline, 5 reels grid, but then you also have the chance to trigger Free Spins and Expanding Symbols, as well as the Wild Collection feature, where potential wins can reach up to ... the cat so cute and adorable