4 Doubles -
Swipe your finger and double 4 times!
Swipe your finger and double 4 times! Once you've found the starting number, you'll have to track your double track four times.
Example: If you find out that the first number is 9.
The sequence will be: 9183672
(9x2=18. 18x2=36. 36x2=72 - 9 - 18 - 36 - 72)
