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I just grabbed Stronghold Cruaser HD for free at Amazon. It requires a few easy hoops to jump through like the download of Stronghold Kingdoms. The whole process (even the download and installation) took less than 10 minutes.
For some reason I can't add Stronghold Crusader HD to cart, it goes straight to a buy page with a separate shopping cart.
Step 1, Add Stronghold Kingdoms to account
Step 2, Link Amazon Account to FireFly Account
Step 3, Buy Stronghold Kingdoms
Step 4, Wait for an email saying you have a 10$ credit for Crusader HD
Step 5, Buy Stronghold Crusader HD
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$24.99$9.81at Green Man Gaming