You can not control your Playstation 3 directly with Alexa, but with additional devices, it's possible. As an example, you can use the Logitech Harmony Smart Control Solution, which includes an "All In One Remote" and a "Harmony Hub". Simply set the hub near all of your home entertainment components, and you can control everything with Alexa on your Echo Dot or any other compatible device! Harmony Hub allows you to control devices concealed behind cabinet doors or walls, such as PS3, Wii, and Xbox 360 game consoles.