Angry Birds Opera (2011)

Angry Birds Opera was a demo version of Angry Birds available for PCs using the Opera web browser. The game was released on the version 12 alpha of Opera Next on October 13, 2011, and closed it's servers one day later on October 14, 2011. As a result, the domain was also closed for a while until it finally expired sometime in the late 2010s. The game was located on opera.angrybirds.com. The game was announced by The Register on October 11, 2011, and was meant to be available two days later on October 13, 2011. It released and was able to be playable for one day until October 14, 2011, when Rovio closed the game's servers without telling anyone.