You need VR to play the VR levels.
Speaking as a person who doesn't own VR, Dreams is the single title which could get me to buy one. The amount of content is just ever-growing, and you could get so many unique and amazing experiences in this that you couldn't have gotten anywhere else :P
You needed PSVR to play RE7 in VR mode. RE7 wasn't a killer app for PSVR though. What makes this different? I mean, I'm open to arguments at this point.
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