The Casebook acts as a substitute for Holmes's equipment. It consists of the following tabs: Tasks, Map, Evidence, Documents, Dialogues, Chronicles, Trophies, Echoes and Character Portraits. Each time when something new appears in a given tab, the icon of it will appear on the screen and an exclamation mark can be seen next to the tab. It is good to view them, most importantly the Tasks tab, Documents and Evidence, as they make it easier to draw conclusions and decide what the next step should be.

Some of the Evidence have a special icon that informs the player what can be done with them - ask someone about it, analyse it, look for further details in the archives or some other actions.

When a given object has been examined completely, the icon turns green. If it's white, it means that the item can be further investigated. Sometimes, an information appears that the object will be of use in the nearest future.

After examining a given object in the close-up mode, normal view should be enabled automatically. If it doesn't happen, it means that some element that should've been investigated was overlooked.

Assigning hotkeys can be done by pressing F1 (PC) or both analogue sticks simultaneously (consoles). An important change is that you no longer have to "drag out" the items from your equipment. When you have an item that can be used on some object or place, the action will appear on the screen automatically.

Escaping the close-up mode when solving a puzzle serves as a reset button - it sets the default state. It is useful when you feel like you're in a dead-end and need to start over or use a solution from the game guide. You can also skip those mini-events with no consequences to the game-play, besides not obtaining the Achievement for completing them.

New skills that allow Sherlock to see things that a normal person would overlook. Use them each time when the proper icon appears on the screen.

Sherlock very often moves from one location to another, which you select on the Map in your Casebook. During these travels, you can view the Casebook and the Deduction Space, so you can make connections between Clues or draw Conclusions, name the culprit, view the Evidence and Documents as you wait.

It is good to make the connections immediately, not waiting until you stack a lot of Clues and it will be difficult to make head or tail of it. Every time when Sherlock draws a new conclusion, the deduction icon appears.

Some Conclusions obtained in the Deduction Space rule out one another. This means that you can go the wrong path and name the wrong culprit in result. If it is important to you to find the right criminal, you can check if your investigation was successful before you make the final decision. You can also check if you've collected all the necessary Evidence.

Each case has only one correct solution, but the choice whether to condemn or absolve the culprit is left to the player to make. Attention! Being consistent in making these decisions will earn you an Achievement.

All the Evidence is marked in red, Documents - in blue, QTE answers - green and puzzle solutions or important information are in bold.

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