I think the game that helps me the most is Wheel of Fortune. I personally find that it's the most challenging DMD era game as it forces you to slow up your play-style and play in control and also has very short ball times. It also helps you with your nudging and flipper techniques due to the unconventional bottom layout. -really good at teaching you when to flip and not flip and really on bounces. It's a bit of a mix between a modern game and an EM. The game also punishes you if you aren't accurate as you need to hit the correct contestant stand-up to lock in the reward.-if you hit the wrong one you can miss out on valuable awards (EB, Trip MB) and you get no second chance as you need to spin the wheel again. I also recommend changing your mb start to "Easy" instead of the default "extra easy" and it makes you have to aim for all of the green stand-up targets spread out over the playfield.