Ouya's $99 game console challenges Xbox, PS4

Over 17,000 developers are using the Ouya software development kit to bring games to the new device, including Square Enix Holdings's Final Fantasy III and nWay's ChronoBlade, the company said. 

Nvidia's Shield is intended for hard core PC gamers with a yen for continuing to play on the go. 

Meanwhile, BlueStacks will target a younger demographic of 10 to 30 year-olds hooked on tablet and smartphone games, said Apu Kumar, senior vice president of global sales and business development, said. 

Its GamePop is "bringing the games you are most familiar with on iPhones and Android to the large screen," he said.