It is interesting that you mentioned about people not being sure why they won when playing some of the new games. I had that problem with the pub "slot machines" in London a few years back. They were played more like pinball machines and took quite a while to learn. Unfortunately there were few if any directions posted on the machines. You could play the machine for 15 minutes and still not figure out when or why you hit a jackpot. They were still a lot of fun.