Xbox Live Gold subscribers can download Shoot Many Robots for free until December 31.
The four-player co-op scrolling shooter is the second of December's 'Games with Gold' titles, following on from the original Gears of War. Released on Xbox Live Arcade and PSN in March 2012, Shoot Many Robots is usually priced at £6.75 / $4.99 on the Xbox Games Store. It has a Metascore of 67 based on 37 reviews. Announced at E3 in June, Games with Gold gives XBLG subscribers two free games to keep each month, with a new title made available on the 1st and 16th of each month.
While it was originally announced as a limited time campaign, Microsoft said in October that Games with Gold would be an "ongoing benefit" with no end date planned.
In November, the platform holder also revealed plans to launch Games with Gold on Xbox One in 2014.