Macheist is doing a new promotion in the form of an iOS app called "The Heist".
It costs 99 cents but is worth it for the puzzles it includes, which are of four familiar types. Once you've solved enough puzzle levels, you get a prize: an activation code for the Steam game called
Eets, which is normally worth $10.
I was expecting to unlock another iOS app, not a Mac/PC game, but hey, I'll take it.
Have fun!