Playig the cups game takes some skill, and alot of practice. It may take a couple of weeks, it also helps by having a nice surface. Like one of those special mats but thats if you want to go pro. Also you can practice anywhere all you need is cups.
Cup stacking involves keen eye and hand coordination so that the game can be performed quickly. Children become fast at certain games because their sense of hand eye coordination and the ability to concentrate on a given task is in some cases better than an adults concentration abilities and coordination.