They can be built with graphics which make the display surface as if it is in 3D. You don’t should put on Distinctive 3D Eyeglasses like in the movies to play these 3D slots, no! Marvel is apparently really having fun with releasing cell games these days, as Marvel Snap https://www.google.fr/maps/d/viewer?mid=1qBA6AW6kc0amztFAM_RwU37UPCMt0JA