If you're a gamer in the United States, then today is your lucky day. Goat Simulator (both versions) is free for today only, presented by Skittles.
The Xbox One version of Goat Simulator is free to play only until the end of the day, but can be downloaded here. The download link will read "Try it Free", but achievements can be unlocked after the game successfully downloads.
The Xbox 360 version is also free to download today, and you can even keep it. No rental here. Once it's downloaded, it's yours to keep. You can download the 360 version here.
It's unclear why there's exclusivity with this promotion, but anyone able to take advantage of the opportunity should do so.
Get the biggest Xbox news delivered straight to your inbox every week.