A pretty spectacular "technical glitch" has caused a large number of games to disappear from Xbox Live Marketplace, including Castle Crashers, Battleblock Theater and over a thousand Xbox Live Indie Games titles. Microsoft is, you'll be unsurprised to hear, aware of the issue, and assures us that it's a temporary one.
Gamasutra reports that the Indie section's total available game count has dropped from 2100 to just 949 titles, and that both the console and online storefront are affected. Milkstone Studios has tweeted that 16 of its 25 XBLIG releases are AWOL. Minecraft: Xbox 360 Edition, Brothers: A Tale of Two Sons and Trials HD are among the missing Xbox Live Arcade games.
"We're aware there is an issue affecting the Xbox Games Store that has temporarily removed some content including Xbox Live Arcade and Xbox Live Indie Games titles," a Microsoft spokesperson told the site. "This is a technical glitch and we're working to fix the issue as soon as possible. We apologize for any inconvenience."
An Xbox Live Service Update suggests that you may have trouble downloading already-purchased games, too. "We're aware that our members are having trouble when trying to find content in the Xbox Store, as well as in-game content," it reads. "Our team is diligently investigating the issue and we are working toward a fix as expediently as possible. We're very grateful for your patience while we work. We'll update you on our progress when we have more information!
Users might also struggle to launch the SmartGlass application on Windows 8. We'll have more for you as and when there's more to report.
Update - Battleblock Theater is back on the PC storefront! As is Minecraft and a fair few Indie games. There's also no longer a service alert on the Xbox Live status page. How are you getting on?