18 days after it debuted in the iOS App Store, “Amazing Alex” has dropped to No.10 on Apple’s (AAPL) paid iOS app chart and to No.99 on Apple’s list of top-grossing apps. Rovio’s new franchise launched in a blaze of publicity two weeks ago, hitting the No.1 position a mere eight hours after it became available. The developer’s original mega hit, “Angry Birds,” took more than four months to reach the top of the chart — but once it did, it stayed in the top-10 for more than two years. Yes, Rovio’s first franchise stayed in the top-10 for two years — and its second will fall out of the top-10 after just a few weeks. Read the full story at Boy Genius Report.