Augmented reality gaming startup CastAR Inc. has raised $15 million in a round led by Playground Global, the hardware accelerator and fund launched earlier this year by Android co-founder Andy Rubin and backed by FoxConn, Google, Tencent and others.

CastAR marks the accelerator’s sixth startup and the latest in growing list of AR efforts seeking to remake the way people interact with the physical world. Like Microsoft’s HoloLens, ODG’s R-7 and Google Glass, CastAR makes a pair of glasses that projects a layer of digital images...