It starts easy but gets harder as you go further. Use Google and Wikipedia to help you. If the answer consists of more than 1 number, they are written side by side without space. Example: 1 2 3 ? ?. The answer is 45. First digit is never 0. Dates are in DDMM or DDMMYYYY format. Further hints maybe posted at the website http://reychiuandroid.blogspot.com