Cardboard is Google's do-it-yourself gateway into virtual reality, letting you strap your Android phone into a cardboard shell (with a couple of lenses and magnets) and immerse yourself in 3D worlds. It's pretty cheap and easy to get started, and there are dozens of apps to download.
Many aren’t great, admittedly—but some of them are, and there’s a wide selection of different experiences worth exploring. Whether you want interactive games, neat video content with added visual depth, or other curiosities to dig into, these 10 top Cardboard apps should amuse you for some time. And nearly all of them are free, to boot. (Remember: the split left/right images merge into one 3D image when you use the headset.)
Also on ITworld: How to build your own Google Cardboard VR viewer
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