So the nook HD/HD+ works off google play. I'm planning on getting a HD. But since it works off Google Play, does that mean I can still use B&N gift cards for purchases, (even for apps)? Or do I have to get Google Play gift cards?
If you buy the apps from the Google Play Store,, you'd need google play gift cards.
You can still use the B&N gift cards for your B&N Nook purchases.
They are two different stores and you can buy from either one or from both of them. Each of them will accept their own gift cards or can use credit cards with both,