Prize posts on the blog work this way, whether for Birthday Week giveaways or other contests:
? To win the prize, pick a number between 1 and 1,000 and leave it in the comment section of the prize post. That’s the only way to enter — emails or entries in other posts don’t count.
? At about 5 p.m. central each day, I’ll go to random.org and generate the winning number. The person whose number is closest to the random number wins the prize.
? You can’t pick a number someone else has picked, and only one entry per person.
? Participants must be 21 and older to be eligible, and the usual rules, regulations, and state and federal laws. In case of a tie, the earliest entry wins.