http://www.schmidtshop.com.tw/EVENT2011/game.php
In addition for different scenes, you can also select different Leica M lenses to "play" with, from 28 to 135mm.
MF is actually not too difficult with proper aids like this and this was actually the only focusing method that I had with my first camera. Try the game if you have not ever used any rangefinder camera, you may find that AF would be boring and is indeed "lack of control" (sort of)! ;-D