You can view the application's minimum requirements on the following website. If your device doesn't meet one of the requirements, you won't be able to play the game. If you were able to play it on your device, it's possible that you get "Device incompatible" error because of your Google Play application. To fix this, go to the Menu of your device > Settings > Applications > Manage Applications > All tab and search for Google Play. Tap on the application and select Clear Data and Clear Cache. After you did this, you should be able to download Candy Crush on your device.