I am giving away 1 mBTC to the person who can guess the number I have in mind
The number is between 1 and 1.000.000.000.000.000.000.000.000.000.000.000.000.000.000
I will answer any yes/no question.
Only 1 question at a time and you are only allowed to post when you aren't the last poster.
If you play it smart you should be able to guess the number in not too many guesses