For this weekend only, Titanfall is free to download and play on Origin! This is because EA is trying a new approach this summer - a "try it before you buy it." Titanfall is first up with many more to come almost every weekend this summer. The entire game is 50GB in size, so if you don't have a fast enough internet connection, don't waste your time downloading the game if you won't be able to play it before the deadline.
If you don't know what Titanfall is, it's created by the former original lead developers of Call of Duty 4 and MW2. They broke away from Infinity Ward and created their own studio called Respawn. Titanfall is their first project. It's a mix between Call of Duty and Battlefield 2142. It's got flying ships, infantry combat warfare, par-core along with the titans (giant robots). I personally played the beta and somewhat enjoyed it. Computer requirements to run the game are minimal. If you can run any of the Call of Duty games on high, then titanfall will run fine on low settings. If you experience low FPS, drop the resolution and texture settings and you should be good to go.