Looks like the coupon for the Trine 2: Goblin Menace DLC is indeed only 50% off as the website states and not 75% off like the coupon says. When you add the DLC to your Steam cart the price comes up as $3.99:
So erh... I finally managed to get hold of a 75% Trine 2 code, I applied the code while correctly following the instructions, but the code isn't appearing in my Inventory (nor is the discount applied)...
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