Crazy Machines 2 is packed with all new features to help you create your wackiest "Rube Goldberg-style" contraptions yet! All new elements, plus an amazing 3D physics engine lets you craft even more complex gadgets and effects.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.