Interactive Puzzle in an Email
![](https://www.emailonacid.com/images/blog_images/Emailology/2016/puzzle_email/eoa-anim-600.gif)
I built an interactive puzzle for an Email on Acid promo. It features rotating four letter combinations that when unlocked displayed a link for a coupon. There were quite a lot of techniques put into the example and it was really fun to build.
Check out this tutorial on the techniques used in the email.
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