The easiest Delta miles ever. Just play the Delta Dash to the Gate game for up to 10,000 miles. It’s a multiple choice game with obvious answers.

You’re almost certain to earn the full mileage since (a) the questions are easy and (b) if you don’t earn the points they give you a chance to play the game again for a better score until you do.

At first I was skeptical about the offer, but the website is an actual Delta site and it’s quite professionally done. Seems too easy to work. But it should.

Update: I’ve already received a confirmation email after playing the game, verifying that I’ll be receiving 10,000 miles. The terms and conditions say the following two useful things:

All SkyMiles members worldwide are eligible for this promotion.

…

Miles will appear automatically on your SkyMiles statement up to 8 weeks after promotion ends.