Download this app if: you have a compatible NVIDIA Tegra-powered Android device.
NVIDIA TegraZone: Find the best Android games.
Finding the best Android games just got easier. With the TegraZone app for your NVIDIA® Tegra™-powered device, you can easily find games that are optimized to exploit the full potential of the Tegra 2, Tegra 3, and Tegra 4 mobile processor....
The zone — If you have a device with the powerful mobile processor inside it, what are you waiting for? It'd be nice if it offered some free demos at least, though.