I'm keeping a look out for better sandbox games. There's a decent Portal clone in development, but it doesn't seem to be worth posting about yet. I'll keep you in the loop.
HTC Vive First Impressions
9 years ago
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I found a really awesome racing game for kids. It has the simplest of controls, just the arrow keys. There isn't a lot to it, either. You start the race, zoom past the other racers and try to collect little crystals to gain max speed. The game's called LudoRace, and you can download it from Graphit-X.
I also found a nice sandbox game (well, sort of) for the younger crowds. The game's called Freeride Earth, and, as the the name suggests, you ride all over the world in a sort of free-roaming environment. Really, you're on a hoverboard in a snowy area, and that's all there is to it. Even though the game is insanely simple, I enjoy its endless environment, and I suspect a young child would stay interested longer than I. The latest version can be found here.