It's easier than you think. Follow 4 simple easy steps
Small-Big Game Formula: The result will be the last digit of the sum all the numbers in the Signature. (Example: The Signature is: "2XsdWBKHhvWyvZyYTjD9XJK4sqEF9". Now we do the calculation: 2 + 9 + 4 + 9 = 24, so Last Result would be: 4. The user who selected "Small" wins).
Countdown Game Formula: The result will be the last 4 digits of the sum previous result and the last 4 numbers in the Signature. (Example: The previous result is 5678 and last 4 numbers in Signature is 6-7-8-9. Now we do the calculation: 5678 + 6789 = 12467, so Last Result would be the last 4 digits of "12467" is "2467". The user who selected "6-7" or "4-6-7" or "2-4-6-7" wins).