This app uses a simple criteria to pull numbers out of the hat. Once you hit one of the colors on the screen we'll use a simple formula to add the number represented by the color and the random number generated by the app, if the result of operation (+ or -) is an odd number then the result is accepted otherwise the app will loop until an odd number is found. The number of times the app has been searching is called the 'luck' of the number and is shown along with it!
So play with numbers and enjoy it!!!