Microsoft has filed changes to its proposed takeover of the video game maker Activision Blizzard, in an attempt to win over the UK competition regulator, which previously blocked the $69bn (£54bn) deal. The Competition and Markets Authority (CMA) on Tuesday said it would investigate the new proposals, under which Microsoft will not acquire cloud rights outside Europe for existing Activision desktop computer and console games, or for new games released by the developer during the next 15 years. The move revives the US tech company's hopes of completing the takeover of the owner of hit titles such as Call of Duty, World of Warcraft and Candy Crush after the CMA in April blocked it, citing concerns it could allow the company to dominate the nascent cloud gaming market. Streaming games from cloud servers is at present a small niche, but the CMA argued that the takeover of a maker of blockbuster games by the leading provider of cloud gaming could prevent healthy competition from forming. However, the UK regulator had appeared increasingly isolated after its EU counterparts passed the deal and the US competition regulator lost a court request to block it. Microsoft had reacted with fury when the UK initially blocked the deal.