I dont think anyone has mentioned how some players can adjust to the machine very quickly. Different machines play so differently and you don't have much time to find the shot. Levi touched on that watching other players- you can find out what works on kick outs and rolling passes, etc., but some stuff you have to flip to find out. I hear folks will change things on their home games frequently to make it more difficult. You can switch from new to old flipper rubber, move posts, angle, tilt, or even set the game to fewer balls to make location games feel easier and adjusting more natural. But I can't say I've done much of that, but you can sure tell when the game at the bar gets some changes/tune up. It's like starting over, hopefully for the better.