A game about permanent growth. Once you grow, you cannot shrink.Hitting something means death.There are blue colored zones, (grow zones) each letting you grow a fixed number of times (displayed inside the zone) by a certain percentage.And then there are green colored zones, (gates) which will only let you through if you are of a certain size. (displayed inside the gate)So growing up has its advantages and disadvantages.

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.