Castle Must Be Mine is a tower defense game brought to virtual reality by developer, TheMiddleGray.  The game features a total of 12 maps, including forest, desert and ice based environments. I have to say, that playing this game rekindled childhood memories of playing with army men or Star Wars action figures. When a game can literally make you feel like a kid again, you know you're onto something special. The game strikes a great balance in how many tasks you have to juggle simultaneously to be successful. It may seem like you're overwhelmed and it's too hectic, but it's just a matter of learning how to take advantage of all the tools at your disposal. I've tried this game on both the Rift and Vive, and prefer to play it on Vive because roomscale just works a bit better.