There are more than 14,000 levels in “Candy Crush Saga”, a maddeningly addictive mobile puzzle game. Microsoft’s attempt to buy its publisher, Activision Blizzard, is encountering almost as many obstacles. The $69bn deal—Microsoft’s largest ever—sailed through the easier stages of the merger game, winning approval from jurisdictions like Japan and the European Union. But in April it was blocked in Britain, with only limited scope for appeal. As we published this, on June 22nd, Microsoft was preparing for a court battle with American trustbusters, who are in an activist mood and seem determined to stop the transaction.