To complete this game you'll need to be able to find items in the environment, use those items while all the time solving puzzles. You'll be able to ask for clues, write down notes and explore areas in which answers will be provided (often in a subtle fashion).
Don't forget to turn your sound on because certain clues may be given with sound. If you don't like the music it can always be disabled during the game via the icons in your inventory.
While playing the game it will be important for you to pick up inventory items throughout the adventure. The items will appear within the inventory at the bottom of your screen. As you solve puzzles the game will remove unnecessary inventory items automatically. While you may not use all items instantly, you will use all of the inventory items in some way to complete your adventure.