Sherlock Holmes vs Jack the Ripper is your standard point-and-click adventure. As you run around the world, you will have to talk to a lot of people in order to get an idea of where you are going as you try to solve the string of murders plaguing London's street-walkers, and, of course, there are the required number of objects to pick up and investigate.
But Sherlock Holmes vs Jack the Ripper's biggest unique attribute is the Deduction Board. When you arrive at one of the crime scenes, you must thoroughly comb the area for any and all objects that you can pick up or interact with. Once you've accomplished that, you will be presented with a screen that lays these objects out for you. You must then arrange them on the Deduction Board to form links between them and then draw conclusions based on those links. This board also gives you access to any conversations you've had or documents you've picked up in order to let you use all of the information you've gathered in your reasoning. Once you've chosen a correct result, you can continue your investigation into the murders of Jack the Ripper.
Sherlock Holmes vs Jack the Ripper offers an interesting feature that I don't think I've seen in an adventure title before. With the tap of the (R) key, you can switch between third-person and first-person perspectives, and the controls also switch to help fit that style of adventure game. I found this interesting because most games simply impose one of the views on you, but having the ability to switch between them gives you a bit of freedom. There were a couple of times when I simply couldn't find or see something that I needed to interact with in one mode, and switching to the other mode made things more apparent. Of course, about halfway through the game I realized that there was a key that showed you all of the items of interest in the room, but I tried to use that as little as possible.
