Along with the common 3×5 layout, some slots have two or more sets of reels, six reels shaped in a 2-3-4-5-6-7 configuration, six reels arranged in six rows, and other amazing mechanics that stand WMS apart the WMS development team boasts of very creative ideas that have taken shape in various ways.In mid-90’s they entered the market of slot machines and have produced over 80 slots since then, both for physical and online casinos. They were initially manufacturers of pinball machines, arcade videogames and even fortune-telling machines. WMS is a prominent long-established developer of video slots founded back in 1943.